Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac184769f3c3c6f…

MALICIOUS

PDF

80.3 KB Created: 2021-06-07 09:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee84f581a0e93d29b24118fe9ca54067 SHA-1: 99dd7b121ca9f19bae39e4afa2264cfce34783f3 SHA-256: 8ac184769f3c3c6f0a1e7a0bbbeb174fa7722a405b3b18296e4a820f2212f4a5
186 Risk Score

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 0.9954

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://archism.ru/pbw?utm_term=rummikub+game+rules PDF link annotation
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/pozowixoku-refatow.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/1035742da5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_604105c749b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcdde1e42e7f.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/fanebi-tiwukowikodelaj-saxugezelomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489835/normal_5fcc6fbf91684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5ffa4000989e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5ff964fba5da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fd79765cc923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fcbf4bb4cbbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5ffeb50aafb84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_606812a389392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_6064938422e2c.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/3a63d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5ff28e78a0a37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5feeda8e4d45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_60602d690cdd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_601a013e5dbf4.pdfIn PDF document text
    • https://xogowabixebeva.weebly.com/uploads/1/3/4/6/134612916/felafapewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_5fd70442ee725.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/748c8e08-905d-4f6e-ac58-e6da3551be7f/89078935391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6c77b4-771a-4cf8-a3cf-703fed38c979/is_pathfinder_enough_for_nda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c701df15-eb07-48d8-b649-1a54950eb929/24613684389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c9251f-55bb-436c-93c2-cb15cd1f1610/vebofagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbeb251-6482-4b40-91de-fb5aa4067d63/blender_tutorial_videos_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abe1e05-194e-46e9-b5be-29d0ed272b82/strategic_management_concepts_and_cases_16th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdd43ab-7cf2-4b1e-8864-19f204cdf242/livepafivemek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2f8730-83e6-4a5f-b500-cdecabe198e2/dosadebabomosojaxudinuduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6ae071-d6a4-4647-b431-a743b99d1a8e/44949351376.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_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 5216 bytes
SHA-256: ab6219977dacdbb15a035c3cd5ae08fe139db4819501d5f351f7ff9f059a9e37
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 11832 bytes
SHA-256: d48809d80cd1cabbcee0cc0743b1f110be6aa2ca04083396f241730606c19fee