Malicious PDF — malware analysis report

Static analysis result for SHA-256 283669062a18953b…

MALICIOUS

PDF

84.6 KB Created: 2021-03-11 02:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14951d74d61bf5a2baef3e77de6c23f9 SHA-1: a9346e24ab6b9a47dbf6901d11699e4e20ab2d70 SHA-256: 283669062a18953b97a879bc3216ab076c658c05f80796de9dc45c8829e487cc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one leading to a website that appears to be part of a link farm designed to mimic search results. ClamAV and ML classifiers indicate malicious content, and the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO manipulation or malware distribution. No scripts were extracted, but the presence of external links and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=atoms+for+peace+speech+pdf
    • https://cdn-cms.f-static.net/uploads/4388274/normal_60430acba28e8.pdf
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fc7e0f1ae718.pdf
    • https://cdn.sqhk.co/sedazozesufu/utidjeX/48562468302.pdf
    • https://cdn-cms.f-static.net/uploads/4478422/normal_60383094c8ab0.pdf
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/kakopezazojarisulano.pdf
    • https://cdn.sqhk.co/govonesed/GE8A7hg/basketball_times_preseason_poll.pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/3761109.pdf
    • https://cdn.sqhk.co/kupemopo/Fjcig0U/8744738887.pdf
    • https://static.s123-cdn-static.com/uploads/4421641/normal_6003d5f373cc6.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/cb1fbe4c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepawi/wifoxujikulusu.pdf
    • https://s3.amazonaws.com/feliso/the_glass_castle_imdb_parents_guide.pdf
    • https://s3.amazonaws.com/bejeseja/school_counselor_personal_statement_examples.pdf
    • https://uploads.strikinglycdn.com/files/dd9ce694-6898-42d4-af3c-b78f0d5d7d59/ipod_nano_6th_generation_charging_cable.pdf
    • https://s3.amazonaws.com/mujesogi/widenutodobavukisi.pdf
    • https://s3.amazonaws.com/memexelu/97469883018.pdf
    • https://uploads.strikinglycdn.com/files/1e4a4bde-cb26-469f-a3c9-f7fd64bbb730/kevowovora.pdf
    • https://uploads.strikinglycdn.com/files/0bb84e32-7ec3-4eec-b993-12539de545fd/tasewarugafojogotutariso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc7.bin
1470cba92f01618b6462309da95375a0dfba9a6b57c965a319e5456312de6edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 5352 bytes
font_01_sfnt_off00011ed2.bin
9edb288d1d6546a78ed772dfd427f5de949fb095ca13997de5702e0cfe2dbd2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 11892 bytes

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