Malicious PDF — malware analysis report

Static analysis result for SHA-256 8447a67a0f55c58e…

MALICIOUS

PDF

35.0 KB Created: 2020-04-14 05:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 05fcbfd73d7bdbef0e35ca764e2d4e51 SHA-1: 39ef2fd2a77e6758ec959d16d9ce278c48c092ce SHA-256: 8447a67a0f55c58ee80f3e407a2058be84c2084f36420f9b4aff99f20e172262
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 appear to be part of a link farm designed to manipulate search engine results. The embedded URL `http://mychemfreeclean.com/uploads/1/3/1/3/131379923/131379923.html#bugs+bunny+cartoon+free++mp4` suggests a lure for potentially malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a high likelihood of directing users to malicious websites.

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://mychemfreeclean.com/uploads/1/3/1/3/131379923/131379923.html#bugs+bunny+cartoon+free++mp4
    • http://mayusilkart.org/uploads/1/3/1/1/131164066/poneko.pdf
    • http://memphiscricketcup.com/uploads/1/3/0/7/130775404/supeviwuji.pdf
    • http://aspaceintime.net/uploads/1/3/0/4/130491271/9275969.pdf
    • http://netjetspilot.com/uploads/1/3/0/7/130739779/d2d9f7c7e0.pdf
    • http://cinqdanceessentials.com/uploads/1/3/1/4/131406714/c967e263.pdf
    • http://2chickschatabouteggs.com/uploads/1/3/1/4/131438268/518124164402a9f.pdf
    • http://dalstonstyle.com/uploads/1/3/0/6/130620716/cbff0b0cfaea.pdf
    • http://bohoislandbaby.com/uploads/1/3/0/6/130605501/bozuzogesor.pdf
    • http://gomoneyatm.com/uploads/1/3/1/4/131406115/660736.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_off0000643e.bin
125fcb1e68a3aea91a69c3079b27e18e7adfbb702cd56b7b764e6c3f8e28d7b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 7064 bytes

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