Malicious PDF — malware analysis report

Static analysis result for SHA-256 358bd9fec9459358…

MALICIOUS

PDF

40.5 KB Created: 2020-04-13 06:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da63d00eaaa7a2426d8e33738360aab5 SHA-1: efb16797a1f1d6dcfb9a8b2fe92deb8173d50b87 SHA-256: 358bd9fec94593584c2749077c43e2c87dc74476d21a231d9f407117098a2d42
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, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a reference to a URL that is also present in the heuristics, suggesting a deliberate attempt to redirect the user. No scripts were extracted from this sample.

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://amandamancini.com/uploads/1/3/0/6/130639272/130639272.html#variable+dependiente+en+una+investigacion
    • http://lovesomeglitter.com/uploads/1/3/1/4/131437410/9918194.pdf
    • http://primesenior.org/uploads/1/3/0/8/130874600/ad4bd.pdf
    • http://miketoshach.com/uploads/1/3/0/5/130588427/1781178.pdf
    • http://zagobella.com/uploads/1/3/0/8/130813118/polomenagokuxitusebi.pdf
    • http://reclaimyourhealth.info/uploads/1/3/1/3/131397983/3797543.pdf
    • http://gloriaanholt.com/uploads/1/3/0/3/130323319/ziwirekev.pdf
    • http://thewrittenrose.com/uploads/1/3/1/3/131384613/kuzozagikimefapozu.pdf
    • http://lisabouschet.com/uploads/1/3/0/9/130969942/jadapapuzazefataw.pdf
    • http://vicandjotea.co/uploads/1/3/1/3/131379586/1355728.pdf
    • http://beachhousemv.com/uploads/1/3/0/2/130289448/xalok.pdf
    • http://allanafinlay.com/uploads/1/3/0/5/130539270/zekewupep.pdf
    • http://lisabouschet.com/uploads/1/3/0/9/13096
    • 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_off0000747e.bin
c786cec92219e030ccf02056ba540edd5a6ca2d2fb9587235090bc2715ec15e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747E 9216 bytes

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