Malicious PDF — malware analysis report

Static analysis result for SHA-256 193a93ad200bf94d…

MALICIOUS

PDF

40.1 KB Created: 2020-06-03 19:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 395088ea694a36a729e76bfa898b98c8 SHA-1: 617bfe646fa223e6e0f765835c6b7e4961faa78e SHA-256: 193a93ad200bf94d0425d9299d9d035461e646b1c978c4d8611f04c4e981546a
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely related to phishing or malware delivery. The authoring application 'wkhtmltopdf' is noted, but does not directly indicate a specific family.

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://thesoonernetwork.com/uploads/1/3/0/5/130551839/130551839.html#distributed+services+with+openafs
    • http://initiativesduvivreensemble.org/uploads/1/3/1/1/131164159/zanevetosat.pdf
    • http://nanopintechnologies.com/uploads/1/3/0/6/130605204/261964.pdf
    • http://mainstreetchardon.org/uploads/1/3/0/9/130969183/sezeles_mixazixil_zafakewisupobir_niwogeximi.pdf
    • http://middleagedpinay.com/uploads/1/3/0/4/130483067/loxiloxutip_wofenudezije.pdf
    • http://laciepricedesign.com/uploads/1/3/1/4/131407117/162db8a55.pdf
    • http://sparkleandglocleaningservice.com/uploads/1/3/0/2/130289339/golaxebetofi.pdf
    • http://autodiscover.pitchforkpreserves.com/uploads/1/3/0/6/130604470/eeedb5d4c301.pdf
    • http://compass4kids.com/uploads/1/3/0/8/130873822/jinufedaruno_nejidivamom.pdf
    • http://marcquateau.be/uploads/1/3/1/0/131070527/5708220.pdf
    • http://floortilehouston.com/uploads/1/3/0/3/130323972/318849.pdf
    • http://thesoonernetwork.com/uploads/1/3/0/5/130551839/terms.html
    • http://thesoonernetwork.com/uploads/1/3/0/5/130551839/dmca.html
    • http://thesoonernetwork.com/uploads/1/3/0/5/130551839/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://regumawudabi.files.wordpress.com/2020/06/mujupona.pdf
    • https://vupovavov.files.wordpress.com/2020/06/sefowet.pdf
    • https://xibelilunaf.files.wordpress.com/2020/05/58416971317.pdf
    • https://lebavop.files.wordpress.com/2020/05/seromerisilovokorox.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_off00006f8f.bin
ab678a9f1a61e4fed8bed9bd3a95b3d6591d2c73c774f323b226cd32802560bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 10704 bytes