Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec484f13affd1a95…

MALICIOUS

PDF

40.7 KB Created: 2020-04-01 22:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13a07e442b64302b81d7866f520caccf SHA-1: cd0f3dda75a48475e147b432bdc5d0bb9529cc07 SHA-256: ec484f13affd1a9511afbd3704b8156eb042274e7e64dc9d73fa2a896af740f8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. 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://stopeurocide.com/uploads/1/3/0/3/130323635/130323635.html#tqdk+alman+dili+kitabi+pdf
    • http://ksblogostics.net/uploads/1/3/0/4/130489080/murunitegisituv-wozipufexoz-seradixupazex.pdf
    • http://kingoffalafelandgrill.com/uploads/1/3/0/7/130776196/787abac12.pdf
    • http://scribejar.com/uploads/1/3/0/7/130776760/xogov.pdf
    • http://reachlearning.net/uploads/1/3/0/7/130776204/67a5d7ed7cf.pdf
    • http://davenaaron.com/uploads/1/3/0/7/130740493/722759201f.pdf
    • http://salesale.space/uploads/1/3/0/7/130740068/397588225c9.pdf
    • http://associatesafety.com/uploads/1/3/0/8/130814586/01bad6474.pdf
    • http://jobo-natuurfotografie.com/uploads/1/3/0/7/130740124/5045144.pdf
    • http://jakeandgigi.net/uploads/1/3/0/7/130775337/582910.pdf
    • http://g3ie.com/uploads/1/3/0/4/130476359/1109913.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7b.bin
fafa4577713908431970068e330dcfbdc8125e8eb90566025ff39ce8cf115da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 10336 bytes
font_01_sfnt_off00007e5c.bin
620306c92cb44c63465559720e210dfdce5d44645c6c26dcecf738bc0e596ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5C 16280 bytes

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