Malicious PDF — malware analysis report

Static analysis result for SHA-256 3377353ed01ecfdb…

MALICIOUS

PDF

80.2 KB Created: 2021-04-19 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49aaace903112d689c7c7d83ef170e3a SHA-1: 8b6489212c787ecfdd3ef447756262e311249025 SHA-256: 3377353ed01ecfdbde158154718bea5973252791f631927ca210333802eee062
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs, many of which point to disposable or unknown hosting, suggesting a link farm or distribution point for malicious content. The document body, though heavily corrupted, appears to be a lure related to fixing a sewing machine, which is a common tactic for phishing or scam attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=how+to+fix+my+old+singer+sewing+machine PDF link annotation
    • http://greatholl.com/construction_quality_management_plan_templatew0z2y.pdfIn PDF document text
    • http://trynutra.shop/badyet_diary0p6gg.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/idjNhgV/sourdough_sandwich_bread_recipe_king_arthur.pdfIn PDF document text
    • http://dusogewosat.iblogger.org/cell_cycle_regulation_pogil_answer_key.pdfIn PDF document text
    • http://2022god.com/acc_aha_guidelines_congestive_heart_failure28orb.pdfIn PDF document text
    • http://vknart.xyz/juxovitelexidl7c7a.pdfIn PDF document text
    • http://studyweb.site/jevagejemd3sx5.pdfIn PDF document text
    • http://nikecortez.net/yx28x4_graph_brainlyz31d0.pdfIn PDF document text
    • http://wownatural.fun/finding_volume_of_a_rectangular_prism_worksheetqqjb4.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/jorumumewozx6td.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/xzHsThf/kontrabass_cello_duo.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/eiggPie/construction_company_website_template_wordpress.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://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_b698696714aa4c9ab9c078e1056aaf35.pdf?index=trueIn PDF document text
    • http://rabogefegu.epizy.com/93873696409.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/4g_lte_switcher_app.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_1d2b3b3bc984463b916f222c5c9d2151.pdf?index=trueIn PDF document text
    • http://zexukojol.rf.gd/nedemorikevimixi.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/85794091761.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_02eab6b71c5a4f10943d087611d48901.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/tuwuwibimu.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/asus_rog_phone_1_android_10.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_36633034abc64a0e876b7d1af1d870d4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5444 bytes
SHA-256: 451112b67aefe4c49d9ec0ff2a8a84bab49203b9e4ecf91ed4e6d6cc310142d9
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 10448 bytes
SHA-256: 1eac18e247ef7ba3cabe1e8212c7ef6d1ba35c082cbccfe3c7f117299af7190a
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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