Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5f1674467e9e79…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 08:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1225c8a416858347efb98961bbbae217 SHA-1: 7538a4955ed580080d8c3395411a213f888f7e96 SHA-256: 7f5f1674467e9e79a7a81f09ee73eeb70bb812bf5f700cec462b7239ea761022
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 0.9997

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://maypoin.ru/award?keyword=attention+deficit+hyperactivity+disorder+a+clinical+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393791/normal_60290e0aef0e5.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/CYlHjit/case_39_movie_tamil_dubbed.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/langman_s_medical_embryology_12th.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/hard_american_history_trivia_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fe632d012831.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/ilnOibr/timanasozotomuzuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_602dd3af9a72a.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/Bfje2if/58509536993.pdfIn PDF document text
    • http://fatiberekizibu.iblogger.org/vapej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/nizeg.pdfIn PDF document text
    • http://togewogovimome.epizy.com/homeostasis_and_negative_feedback_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88aa71e8-1005-4290-8379-e281773f0454/gegipobamekepar.pdfIn PDF document text
    • http://tosurok.myartsonline.com/matulobawijegudexem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be6f9dd-7da1-43e5-8819-cc6aaae3b1f2/wonoj.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/add_and_subtract_fractions.pdfIn PDF document text
    • http://zokowaxogo.rf.gd/botawalifi.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c3de8095043b47d6aba22356eea39664.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_b242be5c1e314aa69ace6c640a41d663.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_574a41dea707477fafed72d81452a03f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c3cf4a-5dee-4b69-b7ae-caf60453cc3f/89475364401.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_483a319569934db28217798afe9550f2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 5692 bytes
SHA-256: d9fe566de0a5188e6fabd8b6235c57f01770eab1b6eb825099b506a54cf7a015
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10340 bytes
SHA-256: a1eb5ae34afb7915ae2e21273193da8ff70928f2182d2651526b1dc61fba95ec

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