Malicious PDF — malware analysis report

Static analysis result for SHA-256 5956ef97817d11dd…

MALICIOUS

PDF

43.3 KB Created: 2020-04-07 09:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1672f69fd59a7e8eb263fbeec6b3bc51 SHA-1: 4c58f6a2994e6b2cddce81f0a6e46d4ded2f0fce SHA-256: 5956ef97817d11dd8217523b6a173d53dc19a63edafa9bf3cc257cd7d400f6f4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named PDFs, indicative of a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to a 'guide' and includes URLs that are likely used to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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://agewellfinancial.net/uploads/1/3/1/4/131438579/131438579.html#wow+bfa+feral+pvp+guide
    • http://a1muckawaylimited.com/uploads/1/3/0/8/130814706/5473c.pdf
    • http://arloconstructionltd.com/uploads/1/3/1/0/131070131/xijugesulof-zupoderujawub.pdf
    • http://goedhartagency.com/uploads/1/3/0/2/130288430/4556518.pdf
    • http://tabtransport.com/uploads/1/3/1/3/131380495/670489.pdf
    • http://napoleoneplumbingandcarpentry.com/uploads/1/3/0/2/130289652/5556116.pdf
    • http://pegasusglobalfinancecapitalsa.net/uploads/1/3/0/5/130590545/c0624ed95eaabe.pdf
    • http://birdinsights.com/uploads/1/3/0/7/130738912/fuledijukelibuz.pdf
    • http://7ranch.org/uploads/1/3/0/5/130551599/129b05c5.pdf
    • http://votened.net/uploads/1/3/0/6/130604556/bugugofasebatesaka.pdf
    • http://harperlane.org/uploads/1/3/0/2/130272610/716cf81fe0.pdf
    • http://nycsurj.com/uploads/1/3/1/3/131380773/a461f379.pdf
    • http://tinyinnovative.com/uploads/1/3/0/7/130740562/9724960.pdf
    • http://snowjackalope.com/uploads/1/3/0/7/130740378/d4e8951.pdf
    • http://kapaconsult.be/uploads/1/3/1/4/131453720/xutagi_xabuf.pdf
    • http://rentinumbria.net/uploads/1/3/0/5/130538836/2007558.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_off00007fa7.bin
11ef5d2b3ce72a99fb53f44d22c15378a831a582d67d385d20b616a4a96049d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA7 8532 bytes

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