Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44fdb21ea3a43a5…

MALICIOUS

PDF

35.0 KB Created: 2020-04-09 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d644cf1ede7dcaa539f4d04e34023cb9 SHA-1: 00db400b05e3bc4b144c304c41f653587afc8c6f SHA-256: e44fdb21ea3a43a599324fdd55be793f43a307e2fec3846091563737ce8d13e0
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common technique for SEO poisoning or redirecting users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'The metabolic typing diet' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of linking to a large number of external PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://subwaynewry.com/uploads/1/3/0/5/130546742/130546742.html#the+metabolic+typing+diet
    • http://ozarklandscapinganddesigns.com/uploads/1/3/0/6/130621800/f27038bf3f5.pdf
    • http://dimichlboutique.com/uploads/1/3/0/7/130740624/6905241.pdf
    • http://kayscaninecaregiving.com/uploads/1/3/0/7/130738984/4f531684.pdf
    • http://clonmeltuitionacademy.com/uploads/1/3/1/4/131453808/fovikinaseroduwufuda.pdf
    • http://knightsencsd.com/uploads/1/3/1/1/131164462/guvitigezitogodobuw.pdf
    • http://unitedcraftgrowers.com/uploads/1/3/0/6/130639812/ruzadowemesarin.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_off00006035.bin
c62750eba8d75bd401725d2fe1447441a2605b0dc937ded54cb888ab2d7ece77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6035 7636 bytes

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