Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2757c97cc84cc2e…

MALICIOUS

PDF

73.2 KB Created: 2021-01-25 14:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 397367a51b7134e1fd242e05581311a5 SHA-1: 15268f295aafbdad8bb1d79a64dd2526d12e52e9 SHA-256: a2757c97cc84cc2ecd6d0e56cd2974e2549b9bedbd3c46ebfea63e48d351094d
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 0.9996

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://jottigo.ru/aws?utm_term=business+process+chart+template PDF link annotation
    • https://cdn.sqhk.co/fasotaluvose/gfMjhNG/41603487920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd6e1d1e2859.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ajg2Ngg/korijovinodujivax.pdfIn PDF document text
    • http://cafe-cok.ru/mijogafidanalinolutelijuva7wqn.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/gCiffMB/96194384440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5fe6d191e62f3.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ghfhiha/36508058040.pdfIn PDF document text
    • http://gsmall.space/favofusuverirugidurrok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ff00a57c19df.pdfIn PDF document text
    • http://jnatural.space/streaming_websites_for_tv_shows91fcd.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hhON4gd/lagimitu.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/W5riGDb/40896991647.pdfIn PDF document text
    • http://pubguckazan.com/the_last_stand_game_series3pb6r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fdaeddb4dcaf.pdfIn PDF document text
    • http://outputqwvk.space/96448664333x3bbn.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/5DEUXRB/19717461997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382408/normal_5fcdcccf23a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5fd772dead807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fe9e4ebea912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximitexus.epizy.com/fatipotix.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/google_account_bypass_apk_7._0.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/game_pokemon_android_gba.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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 5224 bytes
SHA-256: d8ef52a09d324bea940cd3fc5e7fc2f0fd33e1fe5fb0ea982886139008b968f1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 9836 bytes
SHA-256: 527863588d6dc219ff0ef6028227ad32ec4715ca7f469d95b91451902361e57f

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