Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a655503e103c57…

MALICIOUS

PDF

82.7 KB Created: 2021-04-10 05:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b7faf4da2b49cd4709e11ab662a696e SHA-1: 9de73032c538528795a0bda823129abc23a2c81a SHA-256: 83a655503e103c57d76bcf3139f20528c75abb6f0c6c16b8fff78dd40696c174
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/strik?utm_term=cuanto+es+1+25+pulgadas+en+centimetros PDF link annotation
    • http://fakixigulidol.mywebcommunity.org/70966959755.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/eCidhtP/unnatural_selection_netflix_review.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/giicphh/waterslide_decal_paper_walmart_canada.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/viradububuze.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/Rbidhgs/drift_zone_2_v2_4_mod_apk_obb.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/2494587200.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/wuwofamidibugorase.pdfIn PDF document text
    • https://gobujapupi.weebly.com/uploads/1/3/4/7/134725152/b9efd22a9805d.pdfIn PDF document text
    • https://fizilotot.weebly.com/uploads/1/3/6/0/136050642/4022413.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/pte_practice_test.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/brief_answers_to_the_big_questions_book_download.pdfIn PDF document text
    • https://lofitira.weebly.com/uploads/1/3/4/3/134350427/pawetol.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/kufifuzatafisij.pdfIn PDF document text
    • https://cdn.sqhk.co/zepigelona/dqn1tmV/87870713447.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/415795348.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/sony_wh-1000xm2_vs_wh-1000xm3.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/g2OTM3S/twist_and_shout_violin_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/stranded_deep_latest_version_64_bit.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/88992716314.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/wapanadubom.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/zambia_news_report.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 5604 bytes
SHA-256: e52e3b7737dedcc3a58039e36df8d5048432955bee74b568bf03043ba08b2026
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 11920 bytes
SHA-256: d9f0a61db41175cfcc34d2d8168164545c1292b3ed63aa7949609f4baebfce18
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16168 bytes
SHA-256: 272e514f9476ad5cd2c4d41db085ae12b690bbce6a01a77bc2293bec534ca399
font_03_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2