Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91e542125cab5fa…

MALICIOUS

PDF

73.5 KB Created: 2021-03-11 00:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa2b3abda4272359310efaf50c7a8e2e SHA-1: 5983712e94f2e11073b7bc7931dc088ea783c155 SHA-256: a91e542125cab5faa167bc4a6647db1c448492f8d92b50d4d613cc12cc31b6d2
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=download+morningstar+direct+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60454b8fb4aec.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/oNidMP6/40595189033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_5fe66afd854d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_602da92ae2e14.pdfIn PDF document text
    • https://xamoxuwubedus.weebly.com/uploads/1/3/2/8/132814415/gogigofufewav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ffe421899ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_600c83b7178a5.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/2357899.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/UgfLjhG/snow_bros_2_apk_mod.pdfIn PDF document text
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/gixitiba.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/jeja0IB/derofevedagas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5ff864a050672.pdfIn PDF document text
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/bigusitikotitaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_6044f6a48c383.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/JHljaja/14110738137.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/ejiEyhi/jatizusajosolibu.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/gcjdjfh/thoracic_cavity_contains.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/ca59b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medemamonolusav.rf.gd/zudelusaw.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/lerosutowawigabadamu.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 5564 bytes
SHA-256: 779b74610a5aa6008ce51de308f30b3423fe6f3053e13272368220084dc120d9
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10656 bytes
SHA-256: d65f3e0b4e586b7e82639de8573433a30dbb988834ffd1a0e9b09236e17d5dbf

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