Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb1143af4ca0f30…

MALICIOUS

PDF

79.1 KB Created: 2021-05-05 11:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4158b56713d63385fc39c8ae63057bab SHA-1: 1939145a879a9b4e2de47cffb71b240351499564 SHA-256: efb1143af4ca0f30708f8042eae5abc34244a76c3561c54b55f8fd03fb53d274
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=how+to+clean+your+krups+nespresso+machine PDF link annotation
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/cc706c0b8.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/cual_es_la_oracion_comunion_espiritual87shk.pdfIn PDF document text
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/kawesuforixop-zebetuvus.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/laxopawuj.pdfIn PDF document text
    • https://dadurafiwazozu.weebly.com/uploads/1/3/4/7/134768329/20b021af895a2.pdfIn PDF document text
    • http://sivujelofad.22web.org/sazuvuvo.pdfIn PDF document text
    • http://normaa-id.com/how_long_should_i_study_for_cfa_level_15nv7r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/93065725655.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/lumalupimapanal.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/17982714152.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/above_all_power_audio.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_d71b3c72f1e84472a244ccf16dad6783.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bakoloj/niwuxaruzesadewev.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/dummy_s_guide_to_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/77741235252.pdfIn PDF document text
    • http://ziresam.rf.gd/how_to_survive_parental_alienation.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/374540422.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_c71b4ec1dcf949038406d362aaf59f3d.pdf?index=trueIn PDF document text
    • http://wodedane.rf.gd/rukagobekadinukufowepu.pdfIn PDF document text
    • http://vawekud.epizy.com/57383454510.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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 5392 bytes
SHA-256: e5ac34cd596ca0505a75127d59d10d636301ff4c5614116c568281f7ccfc9513
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 10552 bytes
SHA-256: 15ac231a84b52f417f6ac24be1bb576e7d29a51999fe7673734891e27bf6fadf

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