Malicious PDF — malware analysis report

Static analysis result for SHA-256 0767bf8c51b7e4c3…

MALICIOUS

PDF

77.0 KB Created: 2021-02-17 20:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 435c2c2d9a91b3709e1c8f7b7d626a98 SHA-1: c59a33cfe6e79c0099e92d1d92d185f0c09a4fc2 SHA-256: 0767bf8c51b7e4c3c3d688288fd815f1f5a1e7631795bb9bff1d9066b45664f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, including a link farm heuristic, suggesting a phishing or SEO-based lure. The primary external URI points to 'baarspo.ru', which is likely part of a malicious campaign. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful content.

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://baarspo.ru/wix?keyword=william+barclay+commentary+old+testament+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5fe29406cdb09.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/8125698.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/sabobenuwe/39690932082.pdfIn PDF document text
    • http://dudulexo.epizy.com/98752733724.pdfIn PDF document text
    • http://turakolop.rf.gd/88721960347.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/fingertip_pulse_oximeter.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/bollywood_movies_2010_to_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/mensa_iq_test_answers.pdfIn PDF document text
    • http://vixabediwudofi.epizy.com/35479400674.pdfIn PDF document text
    • http://wolevovugubim.epizy.com/foluzupor.pdfIn PDF document text
    • http://xewenofos.epizy.com/42543264924.pdfIn PDF document text
    • http://wivufaw.epizy.com/77445287351.pdfIn PDF document text
    • http://wonenuw.epizy.com/female_reproductive_system_label_worksheet.pdfIn PDF document text
    • http://jipesofu.rf.gd/67580579138.pdfIn PDF document text
    • http://ruzovufu.epizy.com/fasubakuteve.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_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5556 bytes
SHA-256: d839ddf650a3a381164ed898e285aec99f9275cd973a810e6ae3338ee8231991
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 9964 bytes
SHA-256: f6daa8db4dc090685516dab1f319b24c0a85b922f9f437ec5226cc796457fa1c

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