Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d88294eca2ae440…

MALICIOUS

PDF

37.8 KB Created: 2020-04-03 12:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1dad62862699829a4193430f8c26551a SHA-1: 8b1a3b1e4fe5b4e4017fb5415e66e354d8c04d17 SHA-256: 0d88294eca2ae440c8f4f142bb3f3eb6c212bbf6e3f07f46726bd77a331c9221
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 are structured as SEO-optimized PDF gateways. The document body, though heavily obfuscated, contains a URL that appears to be a lure, disguised as a product description. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm, suggesting the primary purpose is to redirect users to potentially malicious content hosted on numerous domains.

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://michaelshusko.com/uploads/1/3/0/4/130478609/130478609.html#smith%27s+50933+electric+knife+and+scissor+sharpener
    • http://jamesmain.net/uploads/1/3/0/3/130313286/86d5ec76.pdf
    • http://kelbyarchitect.com/uploads/1/3/1/4/131406547/186919.pdf
    • http://soullinks.org/uploads/1/3/0/9/130969945/1606ddccfb0ef.pdf
    • http://ml360.org/uploads/1/3/0/3/130379398/7967259.pdf
    • http://burnsblufflodgeathighfalls.com/uploads/1/3/0/8/130813095/bofolexaza_zijegegurogew_lasurexi_dubobiz.pdf
    • http://spyingheart.com/uploads/1/3/0/7/130775791/2678373.pdf
    • http://needles-art.fr/uploads/1/3/0/8/130874269/sofiz.pdf
    • http://krlines.com/uploads/1/3/0/7/130739336/zudaroweraxo_kimesupanirap_napanak.pdf
    • http://amandagirtz.studio/uploads/1/3/0/6/130639621/1623161.pdf
    • http://www.lindacmccabe.com/uploads/1/3/0/5/130550801/b84a758214a.pdf
    • http://coachnaj.com/uploads/1/3/0/2/130272092/2887d4e.pdf
    • http://flahomebuyers.net/uploads/1/3/0/2/130287413/491a1f02c728b.pdf
    • http://catalyst-now.com/uploads/1/3/0/7/130776312/1433088.pdf
    • http://aisthetics.com/uploads/1/3/0/7/130776096/9641620.pdf
    • http://ejvinsbkgeservices.net/uploads/1/3/0/5/130539926/2741060.pdf
    • http://tatassociates.com/uploads/1/3/0/9/130968950/febifataratokeno.pdf
    • http://sticksandcones-outdoorfun.com/uploads/1/3/0/4/130494636/larolexofuxekux.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005706.bin
a3c653d7e1cae0aef1717c428ba1aa0e9eef06d7bf97ba2cacc24efc0c6d0a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5706 6896 bytes
font_01_sfnt_off0000726a.bin
ddc6c38a5929b263b215a5b0c7aa8b1a409f146866f06980111f9f21a6232bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x726A 16036 bytes