Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09ca13747bc066f…

MALICIOUS

PDF

163.5 KB Created: 2021-03-09 05:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 50a493bce9f9d62e8d2c4b4db7b045ab SHA-1: 8cdc84a7dbf93ed4f6e3e35fa09c5e79add8aa80 SHA-256: b09ca13747bc066f29101d9cc3eda088f200c2d3f1ff839aa316187f85f40b89
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'U bahn plan berlin pdf 2020', suggesting a lure. The embedded URLs point to various domains, some of which are associated with potentially malicious content, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=u+bahn+plan+berlin+pdf+2020 PDF link annotation
    • http://sinofat.iblogger.org/nusetuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/WMHVD8h/diversity_jurisdiction_examples.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/48fdec15.pdfIn PDF document text
    • http://khareedforosh.com/toxusojoxajokusilixejkiisn.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/Nbhb6hf/29294076088.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/EWibzhg/dragon_ball_z_adventure_game.pdfIn PDF document text
    • http://byseles.xyz/guest_speaker_certificate_templateygd68.pdfIn PDF document text
    • http://ig-copyrightviolation.com/xilomajekundyy.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/gefemabutorawu.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/mepado-zisefufizi-vabebajoseg-vavegof.pdfIn PDF document text
    • https://tupipano.weebly.com/uploads/1/3/4/5/134598946/tameraxij-sakupopa-tefuvetos.pdfIn PDF document text
    • http://crystal-light33.ru/how_does_a_rear_coaster_brake_workvftam.pdfIn PDF document text
    • http://thelandofbadideas.com/gazizizeneduvee3ht2.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/6dacd68d36e.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/tobojelusiwi/vojevidimajajuxixatuvunof.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/jevob.pdfIn PDF document text
    • http://zopopujeji.rf.gd/9597573286.pdfIn PDF document text
    • http://sugebajofurite.rf.gd/52092797654.pdfIn PDF document text
    • http://sodexodape.rf.gd/nuwubosu.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/difference_irobot_980_et_981.pdfIn PDF document text
    • http://nesitojogosew.epizy.com/figejutuxipafukoxu.pdfIn PDF document text
    • http://gubowejuxenixu.rf.gd/retadeb.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_off000249b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249B8 5356 bytes
SHA-256: 55497dc151af48db06a855b29f3d9d725acefb78ce4598cf4950b850203e3788
font_01_sfnt_off00025be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BE6 10984 bytes
SHA-256: 625f49c4d059ffbe4faca5be1f987f0e6100abca8d5575c00f81e3cf5d9e7690

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