Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7df4ddc476fe82b…

MALICIOUS

PDF

73.8 KB Created: 2021-06-11 06:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 319f7d228e53c21da36fefecfefdf438 SHA-1: dda95ecfd694c52acde2ebd11c4841c3d4b8c9e7 SHA-256: d7df4ddc476fe82be053f0bd569e93385fd4dc2b0db3f4eb2fe84aa6160ab7c5
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-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://synerhu.ru/pbw?utm_term=functional+english+grammar+and+composition+pdf PDF link annotation
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/2441839.pdfIn PDF document text
    • https://nozukevanof.weebly.com/uploads/1/3/5/3/135392293/6623619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd3afb25733d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_601ec09642e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_60152758344be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_60406ad9b052a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60b9efc8bfc13.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/berelex_buzubiv_rasofowule_vonudap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5fe0f495516dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_602b7a1003d0f.pdfIn PDF document text
    • https://wetevuwerego.weebly.com/uploads/1/3/4/8/134896505/9997612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fd27a3798d91.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/50500292-abe5-454f-bd4a-138f58432863/tavuneboxojexupodanag.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144472854/61391539994.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/f/19803814218.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/rewepibijaburebefeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f45136a-08ea-48ad-84c2-83e1492923d1/buramiramanilitiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424c606d-5a7a-47a8-914d-0475e17ba086/mudisujur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96edb94a-8d32-4040-99f2-342877aa2b7d/mezomojezus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd1a1e4-5804-4765-996b-f34d2b40093d/4792924003.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 5524 bytes
SHA-256: 1b9caf4abe83d827a656de45b17c8add3bdafd0a2027cc6cf6e6efbb71339478
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 12248 bytes
SHA-256: f8c2a06bda08b9a80d13354254472ca0314c053a256d5e32a0753ab59e5dd9f0

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