Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac1c4fefc99e91e…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 20:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00cb18f419a5dc7639346d88b31611b1 SHA-1: 4e8daeed62015426b30e88da645aed7a05d9c71b SHA-256: 3ac1c4fefc99e91e37335ef276cc3eb0dcfa2b63350dccb4f2eee37ab9575dbb
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 domains and Weebly-hosted PDFs, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/123?utm_term=dsld+in+young+horses
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/mabigofabumigu.pdf
    • https://bamupenasod.weebly.com/uploads/1/3/1/4/131410012/talizumom.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/acba796e1.pdf
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/5504995.pdf
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/jidedolar.pdf
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/pivamikutobater.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuponefi/boethius_fundamentals_of_music.pdf
    • https://s3.amazonaws.com/tadovu/behringer_xenyx_1202_manual.pdf
    • https://s3.amazonaws.com/falufusu/femc_persona_3.pdf
    • https://uploads.strikinglycdn.com/files/a7aae54b-d1c3-4617-b77f-2f4deaca9c33/83184091231.pdf
    • https://uploads.strikinglycdn.com/files/57502951-bb50-4bd6-aa15-d36d015b3c2d/50377614002.pdf
    • https://uploads.strikinglycdn.com/files/c6acf00e-11c4-4078-91db-89fa38477ebb/mchale_s_navy_episode_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd68.bin
726d3f86744d128626331cc592c295bab20dc7b5f9acd628f206394437d58035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 4976 bytes
font_01_sfnt_off0000de58.bin
b32c8910456ed94176192e30e283782afe6101738175944291b37abf989bd622		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10576 bytes

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