Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8977481bdc4d44c…

MALICIOUS

PDF

74.3 KB Created: 2021-06-14 08:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d176ea92cd73f7919ff7d29ec3723db8 SHA-1: 1ae81b48eec86b69528c54c5b4fc14f59df45290 SHA-256: f8977481bdc4d44c87b40a95c93e6c869817640626fa881d0c3a65df2dde9a0c
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=chemistry+limiting+reactant+problems+answer+key PDF link annotation
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/bibuwu-birazekotajuv-zesoxak-varodufe.pdfIn PDF document text
    • https://lujomawaki.weebly.com/uploads/1/3/4/5/134577487/nizilivomekajud-tetuboraxozawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5fef82f89cd4a.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/jivupufujolo.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/59db1be9d40a.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/5575972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe97ec29e0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_605451b938519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_60336e27c67df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd626d294b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_600dc69065fe4.pdfIn PDF document text
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/829e128.pdfIn PDF document text
    • https://setanalad.weebly.com/uploads/1/3/0/7/130775470/voduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff6c227ab971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_603eb8f610c17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1709f1-e9fb-4ba4-801f-b151e9d5a672/sutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc03f012-f47d-4765-89f7-0baf5b3a4bfa/acca_st_jean_daulps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef9c8f1-b7e5-45d2-b316-8ec2b2b00976/jekavaxopetonibuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183d42e8-a722-497a-8bfd-4eb7d9af9143/rtl_sdr_raspberry_pi_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1605ee-f1ef-47c0-9da9-a98b9c5cd461/3888763900.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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 5652 bytes
SHA-256: 441b934575923b98e2243054bf6a257e2a99c51e43dc2f6b229888246ef809c9
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 11024 bytes
SHA-256: 19e98bf0d96c7a77ef2a79f7e9622ff2ce203dba1f9995e42e868fbc7fcd5d96

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