Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a321db72ec206…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 22:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4d61b4eb2c8afcce9ec7d4d10c5dbd38 SHA-1: da582b1e6f952d18e93ec88e28aadedff7df8de6 SHA-256: a10a321db72ec20677bfe39dcaa3fe60f4bb34b35fc7b963559f4c4f6b91053b
126 Risk Score

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 or link farms, indicating a phishing or malicious redirection attempt. 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 embedded links are characteristic of attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=can+i+use+my+own+router+with+frontier+fios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496165/normal_60137680441c8.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/6cbdbff.pdfIn PDF document text
    • http://podipotekoi.ru/35160775596zd9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_6027351fb44cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6059f280ddbc9.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/1870293.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/chaAgiI/kerinizunositudipuxud.pdfIn PDF document text
    • http://reactivaperu-2020.com/password_protect_hidden_photos_iphone_6m7gxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_605e0f3f731ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fe567d662e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5ff65195c942b.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/f0a5927863f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_605db21766cbb.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/281805ccb80b96.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/gebifufisaladew.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/iCjcIoJ/where_to_buy_cross_stitch_fabric_in_canada.pdfIn PDF document text
    • http://yourlivehelp.com/48701478047cz0kp.pdfIn PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/fdb1704c6.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/hgiinzV/traffic_rider_2_game.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/igiheyi/92181824966.pdfIn PDF document text
    • http://creditreportfast.info/odd_thomas_netflix_mexicog3weg.pdfIn PDF document text
    • https://fetenove.weebly.com/uploads/1/3/5/3/135330361/9378379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5072 bytes
SHA-256: f38fbdc668b41732fabfafaeac8227f13614b3cc38e2aa6b08dcd73b958822c5
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 11124 bytes
SHA-256: 755c6f72306f55d9f83f5b7f19a53ad37cc4401d6c2d13a4202942bfe7f0aed9

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