Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1582d53fcdce42e…

MALICIOUS

PDF

63.0 KB Created: 2020-11-10 00:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bab1ef30d3e4a60046287804c8b64ee SHA-1: bf2d4b10b3b9fbbedd3f58a049907cedc423ac3e SHA-256: b1582d53fcdce42e10d750a9a8dfb747511454665299e194fd8e16bbe53dbec2
156 Risk Score

Malware Insights

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

The PDF file, disguised as a US states map, contains a significant number of external links, indicating a potential link farm or redirection scheme. ClamAV and ML classifiers identified it as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to lead users to malicious sites or download further payloads, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://traffine.ru/123?keyword=us+map+of+states+printable+in+color
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/jigutiz.pdf
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f9765d970b9c.pdf
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/3327184.pdf
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/3b1991390710dae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/phased_array_vs_linear_transducer.pdf
    • https://s3.amazonaws.com/vatakefojunib/26524077853.pdf
    • https://s3.amazonaws.com/kavitokolezub/congestive_heart_failure_2017.pdf
    • https://s3.amazonaws.com/kokesatodixon/96441678888.pdf
    • https://s3.amazonaws.com/daraniwekamidir/chromosome_mutation_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc4f.bin
c5438225bddbda97af3578003fea1530a6cd5e64a7cfa1f72bc34992a9bcc47d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 5292 bytes
font_01_sfnt_off0000ce33.bin
fe0b9c10a357cf15a351fc63f02c8bd0f546df4c140b0549e70e6bb2951ddea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 9788 bytes

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