Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecef6d9f20c4da56…

MALICIOUS

PDF

83.8 KB Created: 2021-03-13 20:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ef2dae7424f91d4c9c35060d2259b153 SHA-1: 285f5549065681050b970b3b979f2819941a7148 SHA-256: ecef6d9f20c4da5680378edce009f5526be6659e16e95645f7fa45d02f887cdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Ti 83 plus calculator manual'. No scripts were extracted, but the overall structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=ti+83+plus+calculator+manual PDF link annotation
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/6695402.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/how_to_get_pokemon_crystal_clear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_6026d4635bbe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_602c241cba45b.pdfIn PDF document text
    • https://zovafizi.weebly.com/uploads/1/3/0/8/130874114/507409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5ff79d0254efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_602766f2ceabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5ffb164369220.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/talabesuxanutevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_600f548358817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/whats_on_the_queso_burger_at_sonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48dd6357-a2e6-4c53-a0c3-34d3341cc756/19994419966.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/beginner_guitar_songs.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/lodivoruvinosekobop.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/aiseesoft_video_converter_ultimate_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a476dc12-8b22-4b2b-bf6e-601d959e4126/irulu_walknbook_tablet.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_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 5148 bytes
SHA-256: 508162035c82b8453c4b5515e1fba400ed4351ac54ebd04fedbbc5f994596009
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 11272 bytes
SHA-256: 40176b255ecda6eee66983926b2f9ff09e4535187d682deffc996e6ec983b012
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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