Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2ff5c837facc8d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 13:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 828346c8e075ca228c94bda500b83e79 SHA-1: 9b5a17737e96ec43b189fd2eb10f4c585e513d2a SHA-256: 2b2ff5c837facc8def9be4e5686284ded977cbc287ffceb745f18a2fd27e17c2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to drive traffic to potentially malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=quienes+fueron+los+filosofos+presocraticos+y+porque+se+llaman+asi
    • https://cdn-cms.f-static.net/uploads/4445881/normal_601da793bc607.pdf
    • http://mamunetosi.iblogger.org/nesixor.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_600c0c3e81059.pdf
    • https://cdn.sqhk.co/tamenotu/XphcGjk/jawirefiriko.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_60155b1f361d4.pdf
    • https://cdn.sqhk.co/nasanoroge/YzhGYge/sowumel.pdf
    • https://cdn.sqhk.co/nejajevafode/1xYxen4/words_in_a_pic_2910.pdf
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5fe9360899e2f.pdf
    • https://cdn.sqhk.co/tajiwikiter/wrhahcn/bolevagobebiwinuge.pdf
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6018e5cd61e6e.pdf
    • https://cdn.sqhk.co/merabuvi/bhb6wie/65427406757.pdf
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5ff16b14c7006.pdf
    • https://cdn.sqhk.co/rowagana/FBibEhh/bigab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_c38266d208be479d938b4ad82a2cd6dd.pdf?index=true
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_734ff81896ea42a9be229230164c2393.pdf?index=true
    • http://navadolaje.rf.gd/make_handwriting_worksheets_free_online.pdf
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_c0ec6f5f0c2e4cdabcaaa5610c951590.pdf?index=true
    • http://bizepusozuj.epizy.com/72690994843.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_913804764e3046b6b5d439b6787de4ae.pdf?index=true
    • http://wilemibum.rf.gd/21128669670.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_e12d84dca0774f06878e1942d41c1cb2.pdf?index=true
    • 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_off0000f01d.bin
ead8018cf521a4c3d403e58144f0f849182b7722e84d957febc10af1446071e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5452 bytes
font_01_sfnt_off000102a0.bin
ffab60b495ffecac9f4577961c408795ee6d72605cd19d7c5273bdd8bdbf99b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 11204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.