Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab1572402b744bd…

MALICIOUS

PDF

78.8 KB Created: 2021-04-19 18:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d78e098fc71ba58bb335c689ad77d971 SHA-1: e7660697966db34fcb8d131d20ad0ae8505d02eb SHA-256: cab1572402b744bdc8b8c55acb8274f87ed16843850431d57f53c734ed5ad4c5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=garmin+rv+760+battery+replacement PDF link annotation
    • http://timawozal.22web.org/xulobuz.pdfIn PDF document text
    • http://goxaterajeronaf.22web.org/thermador_refrigerator_freezer_drawers.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/sinorekulagesefutasu.pdfIn PDF document text
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/vudexemuro_lajoziva_xorumovezoda_famoso.pdfIn PDF document text
    • http://inostrana.com/482178893351qqoa.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/luxoxavawogudugel.pdfIn PDF document text
    • http://wegansit.space/dasokinivpqz53.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/juxowelarotemilimud.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/kinuxuvenofewetimogu.pdfIn PDF document text
    • http://stav-games.ru/77098229108axk97.pdfIn PDF document text
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/wofefugufezebuwi.pdfIn PDF document text
    • http://study-english-05.site/mexalexevefizunodvi1fg.pdfIn PDF document text
    • http://mirror-x.org/engineering_technical_report_format18f9v.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/wavebota.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/rasukomukedi.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/5917657.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/selivuvumepaveb/monthly_budget_planner_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/54193260264.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/free_bootstrap_blog_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/websphere_application_server_tutorial_free.pdfIn PDF document text
    • http://bikumekomem.epizy.com/bhagavad_gita_chapter_15.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_db532fdc168b47f786e4351ca19a30c6.pdf?index=trueIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_6891d43724ae459fabb6334566651a89.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5612 bytes
SHA-256: fa6b864447dd33247f2d1c8379938e95d2c5bf9b5293adc0f2d763abf17512dc
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10784 bytes
SHA-256: 130b603305c1827bcd1fe4644cc6cff975e60ff55ce87d0693ed4ca03a169855