Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b135d4f0d61295…

MALICIOUS

PDF

34.9 KB Created: 2020-04-16 15:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 976b665ebbde691237409919dc5a7699 SHA-1: 526f8a1d281c3a5df62a33e2cc06ad0a525268db SHA-256: 61b135d4f0d6129578b55ddc31741cac159d11643731eda1584af05339e9a2bc
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous external links, indicating a link farm or SEO abuse tactic. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure points to a malicious document designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://spacecreationdesign.com/uploads/1/3/1/6/131637095/131637095.html#altitude+app+android+free
    • http://salandsteiny.com/uploads/1/3/0/4/130483110/naradizotedib.pdf
    • http://fleekstreets.com/uploads/1/3/0/8/130874055/7127092.pdf
    • http://itprocny.com/uploads/1/3/0/6/130622007/99887059ddd.pdf
    • http://palatialrealestate.com/uploads/1/3/1/1/131164038/8967098.pdf
    • http://oregoncitychiropracticclinic.com/uploads/1/3/1/4/131453456/mogiwafufum_jikab.pdf
    • http://lifecelebrationsbysandra.com/uploads/1/3/0/6/130620670/8787012.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_off000061bc.bin
09d771ac0b5f69021427a1cd8199d717698600908cfacd9a75d5b6e61718facd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 7712 bytes

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