Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eef75fbe5f602a…

MALICIOUS

PDF

102.3 KB Created: 2020-06-01 03:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b781ebeb558370283eb4c448d73f846d SHA-1: 5c403b95897bc163a88fec9fe4d79d8bcdcdc1f6 SHA-256: 73eef75fbe5f602a9a1c333e822dd3bce285a2ba62173c8e7511c17c432818ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm of SEO-optimized PDF documents, likely intended to obscure malicious activity. The document body and heuristics indicate a lure for a password-protected archive, suggesting a multi-stage attack where the archive contains the actual payload. The presence of external URIs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://chattriver.org/uploads/1/3/0/6/130620669/130620669.html#chamberlain+garage+door+opener+manua
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jakazikosab.files.wordpress.com/2020/05/basenufirifosejav.pdf
    • https://sujotupuro.files.wordpress.com/2020/05/31206230749.pdf
    • https://fabakimuli.files.wordpress.com/2020/05/bururapomumasalujesapef.pdf
    • https://gupadolajiwu.files.wordpress.com/2020/05/nubovuximi.pdf
    • https://zakudapure.files.wordpress.com/2020/05/83494093925.pdf
    • https://jekokugin.files.wordpress.com/2020/05/88482379134.pdf
    • https://dasawiduved.files.wordpress.com/2020/05/bedaj.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/dexepipixata.pdf
    • https://tasoxilo.files.wordpress.com/2020/05/zifatosokufepelerapuzufa.pdf
    • https://tokatoxosi.files.wordpress.com/2020/06/689040148.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c2a.bin
767da504c24c2da6186d643ea768b49a9e7bbe49229f81b42085ad6bf49a09cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 12236 bytes
font_01_sfnt_off00017598.bin
8cc95e3d19fa6ca900d745fe5c1aa46ad41531233c836e2834ac41d51361d558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17598 16448 bytes

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