Malicious PDF — malware analysis report

Static analysis result for SHA-256 868486d500fcc4a4…

MALICIOUS

PDF

39.2 KB Created: 2020-03-31 22:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 168f6dbc4b47758e1191e3bba435e860 SHA-1: f1794f2be1f5ac022c009a499fd800399b884ccf SHA-256: 868486d500fcc4a408d07710ac24ac1661219f39613898d1203b63cf47c844ea
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of many external URIs indicates a potential distribution or redirection mechanism. While no scripts were explicitly extracted, the structure and heuristic firings point towards a malicious intent to redirect users or host malicious content.

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://block1949-asu.com/uploads/1/3/0/3/130313453/130313453.html#actividades+de+evaluaci%C3%B3n+final+para+preescolar
    • http://candyvorecreative.com/uploads/1/3/0/7/130775150/dipirawulotibok_filonibawoxoz_garif.pdf
    • http://golddredge2.com/uploads/1/3/0/5/130588906/bosedi-nujijanud-dolajesiso.pdf
    • http://livinginmycloset.com/uploads/1/3/1/0/131071117/4271387.pdf
    • http://asemgt.com/uploads/1/3/0/7/130740538/neluvawijapuf.pdf
    • http://centerforloveandkindness.com/uploads/1/3/0/8/130814311/1926378.pdf
    • http://westvlietstreet.org/uploads/1/3/1/4/131438244/rezab.pdf
    • http://reggieeaves.com/uploads/1/3/0/6/130621053/bukarimesoje.pdf
    • http://collins2020.us/uploads/1/3/0/6/130604016/vowojo.pdf
    • http://stephanielipscomb.com/uploads/1/3/0/7/130775513/kofukixa.pdf
    • http://ancconstruction.org/uploads/1/3/0/7/130740012/cdd91ed64a3641.pdf
    • http://conceptogalia.com/uploads/1/3/0/8/130813301/1e498f6e0656.pdf
    • http://galivantsferryhills.com/uploads/1/3/1/4/131406817/2488673.pdf
    • http://harmonmetz.com/uploads/1/3/0/6/130604414/dalevulekoz.pdf
    • http://quidandpence.com/uploads/1/3/1/4/131407300/mazorodelej.pdf
    • http://fbcpottstown.com/uploads/1/3/0/5/130539820/2b976d467.pdf
    • http://globalbrasiltrading.com/uploads/1/3/0/6/130604456/binefazilopiwal.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_off00006dba.bin
bf0daa836ea61288dc6e3e268e89c20e4851f59536eb6165940dc81ef21932fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBA 8640 bytes

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