Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec7267c8aaffe70…

MALICIOUS

PDF

36.0 KB Created: 2020-04-06 06:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1a6008b5bb5407112a0c209db3ee366 SHA-1: c28055ece571320c99c5b934aa57c9391b3079a5 SHA-256: dec7267c8aaffe70be80274121ec604d859b54a378a297ca78758c0a903b5d51
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to domains that appear to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to URLs that are consistent with the link farm identified by the heuristics. The primary attack pattern involves redirecting users to these external PDF files, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://juliarwilson.com/uploads/1/3/0/6/130605383/130605383.html#gm+diet+program+for+vegetarian
    • http://egschulzww2veteran.com/uploads/1/3/0/6/130603927/wijizenus.pdf
    • http://milescan.com/uploads/1/3/0/6/130604597/c5004d49d.pdf
    • http://fullmoonyogasxm.com/uploads/1/3/0/2/130270885/sixurisejife.pdf
    • http://jimmymachomeservices.com/uploads/1/3/0/5/130551011/0c4ab.pdf
    • http://ecologysolarpower.com/uploads/1/3/0/2/130274241/7407023.pdf
    • http://freeforum.media/uploads/1/3/1/3/131381819/fonobopi-fodowud-likik.pdf
    • http://uminnesotamap.com/uploads/1/3/0/2/130272648/ecc0a1ea42964a2.pdf
    • http://dianaormanzhi.com/uploads/1/3/0/9/130969311/d28e1dce2088.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_off0000678c.bin
e2b5380f6448282e53ed24c7715b887e525143527120a19da302093853ad5aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 7120 bytes

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