Malicious PDF — malware analysis report

Static analysis result for SHA-256 b605cd688743a12a…

MALICIOUS

PDF

74.6 KB Created: 2021-04-11 15:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1f1ab8cc74510709f51626993081b33 SHA-1: 5909df7405066bf0465a80327153ad2f2dbc8b04 SHA-256: b605cd688743a12a0aed6906d99c69b24ec11b349afdfd21824243e3aa2c5e58
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=ielts+answer+sheet+pdf+download PDF link annotation
    • https://cdn.sqhk.co/saseponirifa/WhcQxlE/nerajururumakaz.pdfIn PDF document text
    • http://lumacy.site/pevawidirapale9oo8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_601b1953dcee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_6010546544273.pdfIn PDF document text
    • http://potolkilife.ru/emergency_sounds_full_albuma2v7c.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/bengali_to_english_dictionary_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_60471b3aa88ce.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/pipexulenuzuvatila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60146c5b3e0c5.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/1xVd4m6/zeus_symbol_oak.pdfIn PDF document text
    • http://sentytld.online/smartthings_app_lg_tv628uf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_5fd21974e27c1.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c713601-6a76-4b8b-87c4-f11f69322dcf/a_suitable_boy_episode_2_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9009e8e-cd6d-4f00-92ef-bf71b2d8196f/langston_hughes_fun_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0d8006-922e-4f70-9891-8904c7ca99b2/17238768878.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 5156 bytes
SHA-256: 9fa8d409557827e738575974ab6341aae7dfcc59b1eb3fab97a32f3fe72f600c
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 10112 bytes
SHA-256: fa82183cc529d60081220969b7fa6bb730f9dd71b2d232b4bd9b6571a25fbc80

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