Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df7dbad3c6d8c8e…

MALICIOUS

PDF

73.8 KB Created: 2021-04-17 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a2e5b4cc0d4c51c692fe65fe424b41d4 SHA-1: d2e233154e5fdf173bc52574743a97f10e842e3d SHA-256: 3df7dbad3c6d8c8eee1c081f6b3bf38d2ddf1f0f1d4fdc741f401974a9af703f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, with one prominent URL pointing to a suspicious domain likely used for malicious redirection or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://soxebez.ru/strik?utm_term=heat+n+glo+fireplace+remote+sync PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5fe08479ad0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_6028a5f0d3041.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/egebIii/colorful_cross_stitch_kits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fc7f8e974eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_6049d8e5e6f19.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/ieiavig/90195663857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votatabebunika.rf.gd/english_songs_lyrics.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_65bd39a2844042b4abb9a821c0f0f9ce.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_6623f037b5904fe5920936b80aa1ddfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/cid_bengali_3gp.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_83d1656fdd0d4fdd9fd6a1433dc4e293.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_48659e49d6fd4f478c835ec00aed511f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/11601341013.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/porter_cable_6902_collet.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/23380786733.pdfIn PDF document text
    • http://dumavibir.rf.gd/48869471563.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_9a62afb86d0c4c8da6b7931711c2f31b.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_152c97a91e244493b402b7fe5c299c07.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_5d947d6317b94a71ae125c9de2eb1c40.pdf?index=trueIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_7c0381f07a75431dabe06de276f53cab.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_da8fbe3bd95449329bc99846862b2bad.pdf?index=trueIn 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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 5400 bytes
SHA-256: 2572833487a168fa9851e6db35e8bc9efab66cbc11fa3880444eaa1acfa7681d
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 11144 bytes
SHA-256: 2dfbc551d96468b08bc800133f34d609edea544801860f19ca8f9369a63dba49