Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb842de9661b216e…

MALICIOUS

PDF

74.2 KB Created: 2020-12-29 19:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b6e5e011386fcacc925159ff4babc2f6 SHA-1: be47caf29eb53f56191825529ab20c8ccae46bc0 SHA-256: cb842de9661b216eae7196575ca4c57f7f1789d14d7591adf2b6eef5cf26927a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, indicating a link farm strategy for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

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 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.
  • 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://traffnew.ru/123?utm_term=proper+back+mechanics+pdf PDF link annotation
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/dae2563.pdfIn PDF document text
    • https://zavegikow.weebly.com/uploads/1/3/4/8/134884987/3124941.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/yVhfhid/minecraft_mods_1._15._2_lucky_block.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/A9ifAkJ/photomath_solver_apk.pdfIn PDF document text
    • https://tolisopedigaw.weebly.com/uploads/1/3/4/7/134708633/pafepumobisugad.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/PCPibFn/nail_designs_coffin_black.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5f9f24053bd5b.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/h2Zjcgc/bimupimumelarubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd654b7ad1d0.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/JMhaVge/zombie_gunship_hacked_apk_download.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/b8a863445.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/Ipiijjh/7270577913.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/cJWhhhf/iron_maiden_legacy_of_the_beast_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/eT1hfie/best_video_player_for_android_tv_download.pdfIn PDF document text
    • https://natumelazorog.weebly.com/uploads/1/3/4/7/134711419/3790640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 5568 bytes
SHA-256: ac2204a518edf636287db125b6b6ab3096bcacb564fef58a6251af01bee426ec
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 11068 bytes
SHA-256: 4b43c80d0fcc2ab436db81082978617aa676a436e99e8fcb4b763bfb529ea81b

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