Malicious PDF — malware analysis report

Static analysis result for SHA-256 972b18f401588482…

MALICIOUS

PDF

72.3 KB Created: 2021-02-26 13:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c1158ab5a9704c86c63fe2fed1eef0e9 SHA-1: 89b90bb8cd7507e2fbc596b5263cadf87df39818 SHA-256: 972b18f401588482c91993c49a6021e4180f2726a160fa3c69c2758de6cca3ee
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The document body, though heavily obfuscated, contains a question about human chromosomes, which appears to be a lure to engage the user and direct them to the embedded URLs.

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://gimoguvi.ru/award?keyword=state+which+human+chromosome+has+maximum+number+of+genes+and+which+one+has+least+number+of+genes PDF link annotation
    • https://cdn.sqhk.co/faxixuwako/jdiggdx/zombie_hunters_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/Zgcihhe/41082387134.pdfIn PDF document text
    • https://jafoxoxuxovawe.weebly.com/uploads/1/3/0/8/130813536/toruzojesaj_jugajumaruw_xotumupivobixep_pabize.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/community_service_needed_for_delta_sigma_theta.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/Ydhh7ji/christmas_runaway_bride_2019.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/96592715296.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/40176462686.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/wufujudisu/heroes_and_generals_reporting_hackers.pdfIn PDF document text
    • http://pelubameta.epizy.com/adobe_creative_cloud_error_code_201.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/octave_risk_assessment_methodology.pdfIn PDF document text
    • http://wesekiluxalema.rf.gd/44428680016.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/45105518818.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/latitude_and_longitude_quiz_with_answers.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5836 bytes
SHA-256: 316f532752f90a965577e2680b20ea66426eb005fda6a7c9c2a7a337ff88ff6f
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10800 bytes
SHA-256: a19021cbfc0333cd5289b94901cd6b2d9cdf0d2f1bcf97bb06a395d7b15f109f

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