Malicious PDF — malware analysis report

Static analysis result for SHA-256 923213cf94577232…

MALICIOUS

PDF

76.6 KB Created: 2021-04-22 13:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5049b0f8460700c86a2a9e1da2c4f127 SHA-1: 9d65928d94093942436c21242980d1c8c483b27e SHA-256: 923213cf94577232ccb7f235e104247a2fbc23b90119265f2bec2d7341a08411
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 0.9999

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://kuzutuzo.ru/strik?utm_term=what+are+positive+things+about+yourself PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fe53b7c38e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_600ced9773087.pdfIn PDF document text
    • http://gulexamotapa.iblogger.org/winiwewabefirew.pdfIn PDF document text
    • http://dream-stat.ru/40258282276eoxp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c4a8c1be8.pdfIn PDF document text
    • http://4escam-bot.online/dcuo_feat_guidez1ipw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417523/normal_5ff10719decec.pdfIn PDF document text
    • http://xixosifa.22web.org/54335509866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_9b76d6c008b3466b800a6da1afec2afc.pdf?index=trueIn PDF document text
    • http://xovopoj.epizy.com/power_of_anointing_oil.pdfIn PDF document text
    • http://nemowuroniru.epizy.com/what_are_some_mental_health_questions.pdfIn PDF document text
    • http://bibosisiv.epizy.com/38181384122.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/75486584702.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_79470300f6f64973b33283ae5a42410e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/acer_laptop_turn_on_black_screen.pdfIn PDF document text
    • http://defizal.epizy.com/72793474293.pdfIn PDF document text
    • http://genosumexeser.epizy.com/sesotujatetapejopasonus.pdfIn PDF document text
    • http://suremosanox.rf.gd/edgenuity_algebra_1_semester_1_answers.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5476 bytes
SHA-256: af8a0bd2595b5ca0518546ddb6bc4b564076e5bfcad21a85734575a46fa90ee4
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 11448 bytes
SHA-256: c1acb116d09f8fd9f69ab3899241be115b540b6ca0585d8bec572381b98e5d3e

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