Malicious PDF — malware analysis report

Static analysis result for SHA-256 137e76372a92624f…

MALICIOUS

PDF

31.2 KB Created: 2020-06-03 23:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1093663efa4e964c00507d18831c5829 SHA-1: a1f1d59c770e2f6a2a5df0dc1fb92188dc9e480f SHA-256: 137e76372a92624fe7dc3c10dd3ef1eaac09402368988a637417c6274b374457
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam attack. The ML classifier also flagged the document as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://forgetmenotconsignment.com/uploads/1/3/1/4/131437633/131437633.html#star+wars+rogue+one+full+movie+online
    • http://telatafoods.com/uploads/1/3/0/6/130639810/def21db25986ca.pdf
    • http://armandsen.com/uploads/1/3/0/4/130483756/ef1f9a2640d.pdf
    • http://laneyshomemadetoffee.com/uploads/1/3/1/3/131384128/katajusolesol.pdf
    • http://cctvsystemssheffield.com/uploads/1/3/1/4/131438592/c89165.pdf
    • http://danieldorner.com/uploads/1/3/0/3/130323566/219252.pdf
    • http://instantcleaningservice.com/uploads/1/3/0/7/130776246/gomipe.pdf
    • http://forgetmenotconsignment.com/uploads/1/3/1/4/131437633/terms.html
    • http://forgetmenotconsignment.com/uploads/1/3/1/4/131437633/dmca.html
    • http://forgetmenotconsignment.com/uploads/1/3/1/4/131437633/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nonegek.files.wordpress.com/2020/06/lodanotogiregafemumebig.pdf
    • https://gumusamo.files.wordpress.com/2020/06/xadonotedakavagolilatoxev.pdf
    • https://maforebe.files.wordpress.com/2020/06/lavemirawo.pdf
    • https://xivofupuva.files.wordpress.com/2020/06/wabekaruwatitomek.pdf
    • https://nadomanope.files.wordpress.com/2020/06/89245181253.pdf
    • https://gavadopojame.files.wordpress.com/2020/06/38187194517.pdf
    • https://mudobemazi.files.wordpress.com/2020/06/fibej.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b1.bin
1ea6c97e2a1b2aba69018df2a70cf1e0fd2007f9aecafe4502e42e6fc7fb7d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B1 9532 bytes

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