Malicious PDF — malware analysis report

Static analysis result for SHA-256 0997f2413edf9353…

MALICIOUS

PDF

42.5 KB Created: 2020-03-08 01:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef0a966fa9d63ea1a9fb5d5a97015a0c SHA-1: 9cfcba5b2b5286768845cd9c3c481846707143da SHA-256: 0997f2413edf9353863d250c55df0ce017a279221c9494c4713d0770499a3fd7
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs supports a pattern of link farming or redirection. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://kjtravels714.voyagerwebsites.com/uploads/1/3/0/6/130621614/130621614.html#enterobacter+aerogenes+sinus+infection
    • http://www.taylor--kathryn.rominastiebenphotography.com/uploads/1/3/0/7/130776460/2979535.pdf
    • http://e2dot.com/uploads/1/3/0/3/130313111/66e3722.pdf
    • http://inspiredthriftstore.org/uploads/1/3/0/3/130313613/dajidaki-pipofuburixapi-tirelurifodox.pdf
    • http://nationalchristianhousingconference.org/uploads/1/3/0/4/130435939/daguf.pdf
    • http://www.dreamersandleaders.com/uploads/1/3/0/3/130323172/pivufiwoluxojutadosa.pdf
    • http://broadwateradvertising.com/uploads/1/3/0/4/130435803/d8ea245e5c798bc.pdf
    • http://photosbypri.com/uploads/1/3/0/9/130969179/rilalibubux-vajewiruw-rogul-davuga.pdf
    • http://thekitschkatarizona.com/uploads/1/3/0/5/130544240/xijifitejimok.pdf
    • http://ftworthdefense.com/uploads/1/3/0/6/130639668/2a0779.pdf
    • http://micheldumont.ca/uploads/1/3/0/3/130313405/37e0ce1.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_off00007cd7.bin
69f8c507fddc43530bc3322785163f03b930257b9022eebbdc2a019540c27333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD7 8496 bytes

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