Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72245f731596677…

MALICIOUS

PDF

51.7 KB Created: 2020-04-07 09:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7ef4bb356d2e2a08dce326089022aca SHA-1: 236b919a7a22703e454641fdb9cbd1c1ab398e47 SHA-256: f72245f7315966775f92fff5f88fd7eb825922cd932f51c68967cc83321982fb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though heavily obfuscated, contains references to the linked URLs, suggesting an intent to redirect users.

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://foreverboutique.net/uploads/1/3/1/4/131408614/131408614.html#sorensen+self+esteem+test+scoring
    • http://cubessecurityltd.net/uploads/1/3/0/5/130590499/bavuda_jiraxikimese.pdf
    • http://haverhillelite.com/uploads/1/3/0/4/130436209/bd2b23f3193a12.pdf
    • http://lzcompassionatecommunity.org/uploads/1/3/0/8/130813667/9791399.pdf
    • http://triotake3.nl/uploads/1/3/0/6/130621212/9741191.pdf
    • http://mariyakarcelova.com/uploads/1/3/0/3/130323362/pejetukez.pdf
    • http://tlc-la.com/uploads/1/3/0/5/130539881/51323.pdf
    • http://recordingachievementsedapda.com/uploads/1/3/0/5/130547112/jurevotilu.pdf
    • http://collagis.net/uploads/1/3/0/4/130476748/morub_pogiparolitareb_zuvurez_kifozate.pdf
    • http://rajenakalu.com/uploads/1/3/1/3/131398564/3498036.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_off00009fb5.bin
359496b9ed2be31e62337859f15810aad0e14ab4238f1a3ca9bb35404b2fde8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 8504 bytes

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