Malicious PDF — malware analysis report

Static analysis result for SHA-256 342422bd7d37b7e2…

MALICIOUS

PDF

34.5 KB Created: 2020-04-13 13:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca7feb248abafeb093b198ebceab6823 SHA-1: 9c152cdedf096f94503a7dbe301c41741ccacf7c SHA-256: 342422bd7d37b7e2b439cd169c404daf6711672fdc6dc624224474b7d4561936
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment that it is not benign. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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://cavapoocafe.com/uploads/1/3/1/3/131383342/131383342.html#niif+para+pymes+estado+de+resultados
    • http://theyokoseteam.com/uploads/1/3/1/6/131637257/jesirijogobud_jozofedefusavin_wofapepixu_vikujalafuka.pdf
    • http://blackwoodsprings.com/uploads/1/3/0/5/130588347/laxoletudezo.pdf
    • http://eatdrinkbephilly.com/uploads/1/3/0/6/130603676/nixakazexar.pdf
    • http://cparexcellance.com/uploads/1/3/0/7/130775466/bazepigikone_baxuvij_ruvawivalibade_tanarulelowe.pdf
    • http://mattlobanoff.com/uploads/1/3/0/6/130621839/naxipiwe_nonovesivegu.pdf
    • http://traumreden.de/uploads/1/3/0/2/130289377/tibabujezivilirowipa.pdf
    • http://jrpprimeholdings.com/uploads/1/3/0/5/130547613/lizedavola-xabesedesinife-kujorubezegofe.pdf
    • http://craigsthornton.com/uploads/1/3/0/8/130813786/wipeva.pdf
    • http://moneyney19.com/uploads/1/3/1/4/131453605/c624eaa9011fb0.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c2a.bin
e0beae0666c5dabecad7a4c863e0f9941c3656c73754083d09913ecd094d7acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2A 9032 bytes

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