Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5ca5be39258154…

MALICIOUS

PDF

37.8 KB Created: 2020-03-18 13:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08b67d6b7ce07369c26900b036a62167 SHA-1: 179960e965a5400553a85745920e72f58c0f4fd9 SHA-256: ea5ca5be3925815482683581a9c19aed40051776b11a1dbc383f2bf77216c640
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 commonly used for SEO poisoning or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text is heavily corrupted, but the presence of URLs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users to potentially harmful content hosted across multiple domains.

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://somersetfoodtrail.org/uploads/1/3/0/6/130639258/130639258.html#vita+shade+guide+value+order
    • http://costumiercollection.com/uploads/1/3/0/8/130814993/2757112.pdf
    • http://miko-trans.pl/uploads/1/3/0/4/130488365/makaxitumo.pdf
    • http://www.theartofbelovingness.com/uploads/1/3/0/7/130740077/ba5560a1f5c9d.pdf
    • http://atomicenc2135.com/uploads/1/3/0/6/130621788/nejipiwi.pdf
    • http://prodforms.pama.org/uploads/1/3/0/6/130605133/wazawowukojid.pdf
    • http://treasurehuntergame.com/uploads/1/3/0/2/130274316/5862499.pdf
    • http://www.simplepatches.com/uploads/1/3/0/8/130813837/xebozejuko.pdf
    • http://www.artinthecastle.com/uploads/1/3/0/5/130588653/53851.pdf
    • http://www.testforsiteout.com/uploads/1/3/0/6/130639664/9a88023c2c1c.pdf
    • http://www.blackmagiccurse.com/uploads/1/3/0/8/130813800/xowevur.pdf
    • http://houseofgold.net/uploads/1/3/0/5/130550679/9380552.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_off00006aa9.bin
daead0bfb07e4b67c61e7c983e35a8257c05fa354eb743a62d3029b14de067ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA9 8360 bytes

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