Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f029ddcbe4e9703…

MALICIOUS

PDF

89.7 KB Created: 2021-03-28 19:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28784fa7631f61499fae3d95c8116ed0 SHA-1: 9f38ba975d90fb53d6ea52cd2562cee4d9799973 SHA-256: 0f029ddcbe4e9703ebb5a3489b4eb77382e555aac20d482a00f350014351fdaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a primary suspicious URL pointing to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=run+n+gun+i+love+cats+so+much
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/7601705.pdf
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/pogozot-vuwareweruge-gobef-xizedasiwuzesi.pdf
    • https://zojobowexiwe.weebly.com/uploads/1/3/1/3/131380894/paluxutipejepaxoduki.pdf
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/rekajumem.pdf
    • http://teksalle.xyz/behavioral_intervention_plan_example8c9pp.pdf
    • http://lnstagramsupportingcenter.com/29399642763jtqnl.pdf
    • https://waragorejitise.weebly.com/uploads/1/3/0/8/130813548/81a742d10312c1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/juvetaso/adobe_premiere_pro_cc_2017_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/8aa5264f-da65-4d2a-b715-b4370ec3c152/57489783963.pdf
    • https://s3.amazonaws.com/gawabog/winchester_model_12_youth_pump_action_bb_gun__free_rocket_shot.pdf
    • https://s3.amazonaws.com/rafiralexezol/lattice_theory_birkhoff.pdf
    • https://uploads.strikinglycdn.com/files/7c7f2c9f-6337-4ded-bfbf-574af9d4feee/44316934402.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_ae66e662581946768943a0ba01269b47.pdf?index=true
    • https://s3.amazonaws.com/puretulenuza/jelerafe.pdf
    • https://s3.amazonaws.com/fevobelijogal/caterpillar_ordering_worksheet.pdf
    • https://s3.amazonaws.com/juliziwojatige/code_of_conduct_and_best_practice_guidelines.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_fdeec1228bc14221987cccbf99ce4bb6.pdf?index=true
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_2a7452b4073f4947851f2840535aa166.pdf?index=true
    • https://s3.amazonaws.com/simujix/rusenudul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010236.bin
350112b226becc33f826955791247e7a59c9c191555a570e8720c5a69cf5c474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 4584 bytes
font_01_sfnt_off00011210.bin
a7970d4f90bd53595949996b2336a4618d520efe933557b6874e1ab6c0d86bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 5064 bytes
font_02_sfnt_off00012326.bin
969e13f52fb40d8354bb710833426dd8ded594d9a13782fac6cbf7e7d5ac2d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11088 bytes
font_03_sfnt_off00014906.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 4324 bytes

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