Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18cc92cae889241…

MALICIOUS

PDF

77.8 KB Created: 2021-02-28 13:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c8720b621c6e392463f363048519226 SHA-1: 45642cfc979648c02156492c8592bcf29b025b61 SHA-256: a18cc92cae889241207c17879f7ac60dbe71c418fad924f702ba1c08429a0e7f
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 hosting, indicating a link farm designed to distribute traffic to various malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://soxebez.ru/123?utm_term=what+size+wiper+blades+do+i+need+for+a+vauxhall+zafira PDF link annotation
    • https://berijuwijupev.weebly.com/uploads/1/3/1/6/131637896/fegisugosira.pdfIn PDF document text
    • http://shopmzm.site/79475233621alzkk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_602def8e02a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6020a9fb1a7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_5fe910a882041.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomuvi/QibrFhg/download_game_limbo_demo_mod_apk.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/tiporivo.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/pWjijfO/quiz_bingo_tv_show.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/xCByhfu/67306738476.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/8940161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_602f908727b39.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/5708162.pdfIn PDF document text
    • http://front-glass.space/4054980761960xjr.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/nafibanefexex/org_chart_free_templates_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/enhancement_shaman_wotlk_pvp_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5552 bytes
SHA-256: f98ce393d40cf65abce726368f3d490df1599e5a487488a3e9708128dcf9ba31
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10408 bytes
SHA-256: 85e0d505d46094de6c6a381460283afd5eec4c186ddf4529f1ab0f29abd4b066

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