Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a7f69a99a8f8c…

MALICIOUS

PDF

97.3 KB Created: 2021-02-21 19:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a17ebb63cb35372f69487226e08fd516 SHA-1: 376130200a757b023867e33a969d7ea0bb75bbf7 SHA-256: c85a7f69a99a8f8c6051eaed2738f2c862b8bf3324344f3047da7babf7f6be0f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript, though not fully analyzed here, suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=blood+bowl+2020+lizardmen+roster PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5ff2bbe1ea6b0.pdfIn PDF document text
    • http://nesobaka9.xyz/48454753253p9pf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fd05e577e171.pdfIn PDF document text
    • http://artyom.guru/kujonifefajufo4tn83.pdfIn PDF document text
    • http://strahauto.website/nodokadova8hdhu.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/gcifyjY/stickman_ragdoll_crash_fun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6016f4ab473b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_60322f1b465d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_5fe718cf0c954.pdfIn PDF document text
    • http://prolac.ru/latest_pokemon_game_for_android_freeuv4qp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fdeb4f214d59.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/iesJigg/55757651613.pdfIn PDF document text
    • https://cdn.sqhk.co/biwopeka/hjeifEl/wusipeduwupawon.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/ghFjhtd/peloduduladubu.pdfIn PDF document text
    • http://autoport76.online/sabeziwezirixebokaya9xx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepogedepujadul.rf.gd/41533245206.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/53940986331.pdfIn PDF document text
    • http://zigubogujivo.epizy.com/worebuxanejok.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/best_sad_shayari_video.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_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 5576 bytes
SHA-256: f129e9ff953729bbed17c95b9ced223e3d98d961a64739e2a66905cbf8a6ce3d
font_01_sfnt_off00014fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC1 11656 bytes
SHA-256: aa25cd87ddc0f98fbc50def4d613eee18ba3ae09a3dc97f31bf61c76fc510b54

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