Malicious PDF — malware analysis report

Static analysis result for SHA-256 442ca1a4147ed330…

MALICIOUS

PDF

99.6 KB Created: 2021-05-10 22:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74b9c151722c0fcfb6bcc9760cce7a1f SHA-1: 543b47dc33d4f530a0b3a506b855f1f808f2fc67 SHA-256: 442ca1a4147ed3300c9674036c3dcbdb402bb121b7e046bcba398bffb129a23a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The document body, though heavily obfuscated, contains a search query that likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=ti+nspire+cx+charger+specs In PDF document text
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/1404482.pdfIn PDF document text
    • https://nabodavovi.weebly.com/uploads/1/3/1/4/131406515/roxovas.pdfIn PDF document text
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/xidafosijozeser_zutukok_jafivanija.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/72203408588.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/banosujogixeso_wuluxigisovomo_lajifowogaret_fudaxowo.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/gifadusijeni-saxip-dimomaxuropo.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/40538476295.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/mifudo-befuzipovonezow-xowiripax.pdfIn PDF document text
    • https://xanilavobug.weebly.com/uploads/1/3/5/9/135959945/5fb5295371a.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/ccna_security_certification_practice_exam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivuxo/burger_king_application.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_5bc40e1728ab403da6534cfca6fad1bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/how_to_find_your_medicaid_provider_id_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a657a5-98c6-49aa-ab1a-9abaa91bdba3/15632542693.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/why_does_my_keurig_brew_so_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/c_difficile_isolation_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8e4f9b-6f2b-433f-bbf4-527a1ada02fb/a_composers_guide_to_game_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94d0e97-34d0-4da1-a828-09af1f248a8b/what_does_historia_mean_latin.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/ibps_official_notification_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/9050206988.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_b088fa78b2944682ae71c978a711809c.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_ece826f6d97148c384971f1bab04e6af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bddabdc-0a78-447d-8826-c39d07297e22/yard_machine_lawn_mower_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06af8fba-61ad-4cbe-995c-1e48f3015629/dictionary_of_symbols_j.e._cirlot.pdfIn PDF document text
    • http://winimoviwimi.myartsonline.com/antropoloji_af.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_65ce695bbeaf4450a661e22b51a4c439.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_1cdca21186a54e19b4cc412d027d4332.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 5180 bytes
SHA-256: 24d456b8179c2925c7b386428b75e11b82614ba3218ad1f9b1737e468b7a5b1d
font_01_sfnt_off000144a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A4 11284 bytes
SHA-256: 5dda8944dcec554f79b47c671b6bb9ec9016737246e226cd80355b50b7fac9c6
font_02_sfnt_off00016b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7C 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61