Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5981f07c10df93…

MALICIOUS

PDF

132.4 KB Created: 2021-04-07 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe8d924056739e014e3505a99753c7f8 SHA-1: 1687463e36baa6fdf326316d6f1d02b1a98f346a SHA-256: 7d5981f07c10df935ad93bc16e5c5e7acb8e50bacea67d0e53c61be34760c79e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=bitacora+significado+informatica PDF link annotation
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/5119072.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/9506943.pdfIn PDF document text
    • http://cmbclientes.com/star_wars_alienware0j3nd.pdfIn PDF document text
    • https://lakofureluv.weebly.com/uploads/1/3/4/6/134632848/f1fb6b9c7f210f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5ffa8b66f0ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fd76b5d26e30.pdfIn PDF document text
    • http://cuzinfo.ru/301247751142c810.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/wuwosatexasevezer.pdfIn PDF document text
    • http://tryraisins.pro/what_is_the_best_paid_cdl_training_company0g2zp.pdfIn PDF document text
    • http://didazema.mypressonline.com/what_book_do_you_read_after_the_last_olympian.pdfIn PDF document text
    • http://rocketdocs.us/vuximakivotewizilubxv7kd.pdfIn PDF document text
    • http://pedosapabosa.iblogger.org/el_conde_lucanor_anaya.pdfIn PDF document text
    • http://natgood.space/summon_dragon_skyrim_commandgrqj8.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/client_centred_approach.pdfIn PDF document text
    • https://xobisejuzato.weebly.com/uploads/1/3/4/6/134694252/e1fff3a.pdfIn PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/bebozukelokek.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/9483695.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
    • http://bomatep.rf.gd/94023955038.pdfIn PDF document text
    • http://kuwemujureza.epizy.com/a_level_physics_textbook_edexcel.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/blue_eyed_devil_lisa_kleypas_download.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_off0001b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9C0 5028 bytes
SHA-256: 0dcd3559c3e6e49aab2607fba693a11d2300d734100ac45606dc3a6253061039
font_01_sfnt_off0001caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAAA 13296 bytes
SHA-256: 3b751a6254df06bafd49929bb64a6bde533f57d225ca58f91bff6766cf5f2dcd
font_02_sfnt_off0001f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F428 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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