Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa01b9ef2dc65ab…

MALICIOUS

PDF

84.6 KB Created: 2021-05-21 21:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bdfe213347b5085afcd38f0217d53760 SHA-1: 51102132440f197a04a3b545905bbc6edee5afdd SHA-256: efa01b9ef2dc65ab57740f6312035e974951122f9337dc13bb3ecf620bdbcb5c
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 0.9995

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://seumenha.ru/strik?utm_term=infant+girl+growth+chart+weight PDF link annotation
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/4764917.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/4350768.pdfIn PDF document text
    • https://zativazu.weebly.com/uploads/1/3/4/5/134586929/4137551.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/9d811a14c52.pdfIn PDF document text
    • https://fifiruzi.weebly.com/uploads/1/3/0/7/130775727/7415ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5fcbf05f81b95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402740/normal_60076ea38a00e.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/251637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392207/normal_5fe28dd1ae068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5fe9ff4d8b130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_6012179dcac65.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://uploads.strikinglycdn.com/files/5a7ba4fd-372e-4a5c-a591-93c5751c6dac/15419420253.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/aptt_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/47420031605.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/93337882152.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/calculus_with_analytic_geometry_simmons_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/bbc_bargain_hunt_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfe9a36-174e-43df-8126-30789ccccd7e/nikon_prostaff_3-9x40_torque_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/gw2_professions_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba4aec4-a6c4-4ba5-b64a-fe4069d7699e/single_member_llc_disregarded_entity_vs_corporation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ea0fa0-2561-4f2a-89f1-ce8a39e38bf8/principles_of_mathematical_analysis_rudin_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de760ece-1a1e-4819-aa88-ce23cc1a282a/java_interview_questions_and_answers_for_experienced_topic_wise.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 4784 bytes
SHA-256: fa2b093543f18227d2dc44133bd27a318b04e005ca9bd852f73bb17649b487bc
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10468 bytes
SHA-256: 36e663f1b00f712cadcaca0515932da83dc5fef1a43f57ebd5cd56cfb5c47b9c
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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