Malicious PDF — malware analysis report

Static analysis result for SHA-256 54430d652c1034fa…

MALICIOUS

PDF

69.0 KB Created: 2020-11-13 05:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 28ce1a03988f321f970718044fc86399 SHA-1: 1b1ca86cab244ff7bf38e83e1bbe2088b2d1978d SHA-256: 54430d652c1034fa1f6181dd1cf68c2414efaebb58268f84c7fb2d0ecc766e82
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://trafffe.ru/aws?utm_term=revdl+candy+crush+saga+mod+apk PDF link annotation
    • https://zosevozosi.weebly.com/uploads/1/3/4/5/134527099/tikinirodufenup-fubafojodabeful-rigukegujini-dukuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5f9d3ee1a331e.pdfIn PDF document text
    • https://mosuzikovadapa.weebly.com/uploads/1/3/4/6/134667275/xufolakerumu.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/b5ca49327.pdfIn PDF document text
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/14dedc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87ccfc459fa.pdfIn PDF document text
    • https://xogazusuguse.weebly.com/uploads/1/3/4/4/134479670/karesozej_kigimomot_tujawoteko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5f97939a831a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fa5aa620ce0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/call_of_cthulhu_board_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251b02d3-af93-4444-8723-f55ab4708392/kinunesinuxitasodubutibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef930a07-9ceb-41a6-8b39-2f26f64a0ee8/ffxiv_pugilist_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a14251e-5929-46d8-bfbf-848067431bdc/75618859777.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_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 5720 bytes
SHA-256: d958cd3574c9f97f0e3217b9b2e2dc67d02b1c04021171832776024b08ac0c53
font_01_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 10596 bytes
SHA-256: 83e745ff8f7a15499ac0081660ae1868418b79ff2a8320bff2c7f5f6e360ab5b

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