Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67ea42b3263c56f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 00:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 18aa76c6664941522def1ca60a09d4c0 SHA-1: baa18e559ca29496bf4bd53dcef0a86336e2ab27 SHA-256: b67ea42b3263c56f8f1dc52ff12a26d9c2485ca96bc554367817699174dcbb4e
226 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jottigo.ru/123?utm_term=percy+jackson+the+titan%2527s+curse+filmyzilla PDF link annotation
    • http://creditpm.com/fevunekotufi5laeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jOjcyi8/falling_word_challenge_your_brain.pdfIn PDF document text
    • https://pasirukeb.weebly.com/uploads/1/3/4/0/134017476/5572381.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/hekjhv0/robunenofidazugopa.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/1ojfhdI/bang_bang_bang_bang_sohodolls.pdfIn PDF document text
    • http://denizan.com/bmw_m5_2018_brochure5ivfw.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/icLjhfa/regal_movie_theater_jobs_near_me.pdfIn PDF document text
    • http://dhl-order.info/fuwewugast61i.pdfIn PDF document text
    • http://update-win20.online/drowsy_chaperone_charactersnd726.pdfIn PDF document text
    • http://goodsfor.life/drop_fade_curly_hair_black_males4vku.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/idPgfPg/bosugalakixovugo.pdfIn PDF document text
    • http://ttop-shop.com/bolivia_6_argentina_1_formacionesq216d.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/bajipugotox/C2Fqrie/zemed.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/kixepijap/RRhc1ug/chromecast_built_in_apk_1._36.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzivogawa/7kgfXjh/65144651818.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/g3jghiH/space_invaders_original_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemIn macro / runtime command snippet
    • 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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5332 bytes
SHA-256: 99f499828df942e7da06e002ce107c562d754eef84bb5eea5f124e0465c2072f
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10792 bytes
SHA-256: a37c45533d0d8557424a50db1384afc30ed72372050a336e516a338df9bbd4b2
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2