Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdd370eb9532dd3…

MALICIOUS

PDF

39.5 KB Created: 2020-04-14 16:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 96777814f191df41a229cff377121395 SHA-1: 4957108955ed7cfcfabf0cb3af001e2c14006125 SHA-256: 0cdd370eb9532dd30043ce1c0438e08a371e4463f96ebcbfe3f21dc7ff6ebe64
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'vehicle maintenance schedule excel template'. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence indicate malicious intent, likely for phishing or malware distribution.

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://craniosacralnashville.com/uploads/1/3/0/7/130739128/130739128.html#vehicle+maintenance+schedule+excel+template
    • http://hagahlife.com/uploads/1/3/0/4/130488101/nofewobugugirebojed.pdf
    • http://sportsisland.org/uploads/1/3/0/5/130539305/137322.pdf
    • http://restaurant-lindenberg.ch/uploads/1/3/0/7/130740441/4be1ba1974f1b.pdf
    • http://jaiku.net/uploads/1/3/0/7/130740178/70b9a20ad.pdf
    • http://phantomautodetailing.net/uploads/1/3/1/4/131482999/tixotejikowifuduniri.pdf
    • http://chickhenning.com/uploads/1/3/0/6/130639504/tegare_pugukas_gonera.pdf
    • http://debs-schembri.com/uploads/1/3/1/3/131381904/4918101.pdf
    • http://cruxcream.com/uploads/1/3/1/4/131453182/ddc3435730e.pdf
    • http://b-24-thegreenhornet.net/uploads/1/3/0/4/130477228/d6b21718e.pdf
    • http://maruthomeimprovement.com/uploads/1/3/0/5/130551859/petalonojezusu-kogiwa.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_off000074c9.bin
3f40fe071fb36f73a50d43875ad1d8d194b254b3f6f9adf1c0c32995e7815503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 7436 bytes

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