Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13984ab6001da8…

MALICIOUS

PDF

34.9 KB Created: 2020-06-01 08:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7af9528d488630e31767e746e979a558 SHA-1: c2c43e42a4a11b4262928e10edb4a81abcf275c6 SHA-256: 6f13984ab6001da8bc3be4236e94b4f04f13140c134c89119fd5bc60cf08a4b3
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are structured as link farms. The document body, though heavily obfuscated, contains references to a 'Humana military prior authorization form' and includes URLs that are likely part of a phishing or malware distribution scheme. The ML classifier strongly indicates maliciousness, and the PDF structure with mass external links points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://qacollective.com/uploads/1/3/1/3/131379015/131379015.html#humana+military+prior+authorization+form
    • http://marykateandben.com/uploads/1/3/2/3/132303086/refogadukobi_baneliwosazuta_duxonamuxuk.pdf
    • http://gypsymoxboutique.com/uploads/1/3/0/7/130776749/d1af7edf83249.pdf
    • http://homesboughtfastsutton.com/uploads/1/3/0/8/130813715/fegitiwijobeti.pdf
    • http://steintor.us/uploads/1/3/0/3/130379361/62cdf9b50e478f.pdf
    • http://2306lakeviewdr.com/uploads/1/3/0/7/130775819/kezed.pdf
    • http://garzonm.com/uploads/1/3/0/5/130545816/7367794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pexiweki.files.wordpress.com/2020/05/73463921480.pdf
    • https://kukavigelip.files.wordpress.com/2020/06/lunaxo.pdf
    • https://dojenus.files.wordpress.com/2020/05/metolosirop.pdf
    • https://binutizazal.files.wordpress.com/2020/05/91798848534.pdf
    • https://tigeburilote.files.wordpress.com/2020/05/wafujufalepa.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_off00005c5d.bin
dfa07596bb266f8782a90362e43715ffbb2aa10c9c76c50a6e9d0dc318f1869d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5D 10444 bytes

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