Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cb288bbf20a697…

MALICIOUS

PDF

83.2 KB Created: 2021-02-27 07:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 88c8a667007b8e5c3152e8cd62645222 SHA-1: 26f0cbd45876ed19a6fe8df4f68555b5d7b96a69 SHA-256: 44cb288bbf20a697ccf7a8aa2e100ec1d8bb760e2287cc23dfb43aeda8e0417d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to product cost, aiming to trick users into clicking the malicious links.

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://vilenefex.ru/award?keyword=how+much+does+a+sub+zero+fridge+cost+in+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fd344bc9992d.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/viwubamo.pdfIn PDF document text
    • http://chestlune.online/hisense_h6_series_reviewp0p4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488580/normal_5ff152ecdd721.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/giYhagi/rufutigirumudoxugokun.pdfIn PDF document text
    • http://odemebayisitrafik.com/9222831595115r2h.pdfIn PDF document text
    • http://hdsamara.ru/ffx_chamber_of_fayth_guidemhbfp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_6001f77559d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_602ac0c5c5574.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/3hbhb6P/criminal_case_game_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fdc4635f0e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_602aac0106871.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/surah_al_mulk_ayat_1-10_rumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386836/normal_5fefd353986f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369794/normal_6000c865b01b6.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/dofufiri/glintt_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/full_hd_1080p_hollywood_video_songs.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_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 5648 bytes
SHA-256: 9af5292627a83541c1dad0eb69291fe3d281cb5baa8787fde89a7a6435864630
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10968 bytes
SHA-256: 24c03b09ffa98fd861376b72ebffd54bc0aef5e42cf6bf4287c8f9bb3c01c6a7

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