Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b704e5910fef024…

MALICIOUS

PDF

80.3 KB Created: 2021-03-13 17:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69b4053db4894c423b8b811ed501dd69 SHA-1: 2eadb258a2aee5f14c9cdfc327d747743a904923 SHA-256: 8b704e5910fef02426dc676c810a52f53a49f24a52df888ad2c1329bf55c2ead
134 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. It uses an invoice-themed lure. 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 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/award?keyword=aiag+cqi+15+special+process+welding+system+assessment+pdf PDF link annotation
    • http://kiritisivasol.mywebcommunity.org/demugebumusatozex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5ff1111f21196.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/TYigsUk/fegixoradajisavivo.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/jumpsuits_and_rompers_plus_size.pdfIn PDF document text
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/zexebametizadukusen.pdfIn PDF document text
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/roxulalowujelem_soduneso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_600166e43eb66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_6025c29c1a9ac.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/tupamas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_5fd90371a971a.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/APFR8ij/marvel_avengers_game_xbox_one_release_date_beta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/zimaso.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/answers_to_riddles_in_squirrel_nutkin.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/android_auto_apk_czech.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/jekimulininilu.pdfIn PDF document text
    • http://wimoduwogukuruk.rf.gd/ayo_and_teo_video_3gp.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/manual_de_un_control_universal_rca.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/movies_hd_telugu_free.pdfIn PDF document text
    • http://gozuved.rf.gd/cardinal_wiseman_kingstanding_uniform.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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5960 bytes
SHA-256: 2c67f073f5c94e5f718d6ee92ad725ce25f4dec6ceb86d5442aa981ab79cd885
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11184 bytes
SHA-256: ad43601f758efe9871ba4b1a99dfa0a41462da8da46b234c80c7e522c171673b

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