Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a7d3c0771b6a24…

MALICIOUS

PDF

32.8 KB Created: 2020-03-30 02:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f71f474c2078eff7035f7c72ff12da3 SHA-1: 0469aedd06975e2aa6eefab947188947666f0039 SHA-256: f6a7d3c0771b6a24a89e12611b61c65fe4b1f8b106a86b22a89f31ca8106ff44
94 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, characteristic of SEO link farm abuse. The document body, though heavily obfuscated, contains references to 'Compustar remote manual' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates a likely attempt to redirect users to malicious content or phishing pages.

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/1/3/0/8/130815311/130815311.html#compustar+remote+manual+2w901r-ss
    • http://thelazarusrite.net/uploads/1/3/0/6/130639037/voviw.pdf
    • http://askjj.me/uploads/1/3/0/9/130969206/xigosifijawek.pdf
    • http://wheelhouse.theater/uploads/1/3/0/3/130379391/d7634b014.pdf
    • http://bbcaudio.org/uploads/1/3/1/4/131409546/2950593.pdf
    • http://markslaughterblog.com/uploads/1/3/0/2/130274256/pibakajidumomaf_dogol_figuz_gefagilejosiv.pdf
    • http://uniquevision.ca/uploads/1/3/0/9/130969502/kosudet.pdf
    • http://valleycharterhighschool.org/uploads/1/3/0/9/130969323/79f172.pdf
    • http://arconesllc.com/uploads/1/3/1/0/131069738/82a27b33af5a.pdf
    • http://jinyu.us/uploads/1/3/0/8/130813903/tofimoxu.pdf
    • http://donegalcocowinterweather.com/uploads/1/3/0/5/130589095/sekesuruwuvufefivos.pdf
    • http://orangegerman.com/uploads/1/3/0/7/130776265/xawitaluzasaneb.pdf
    • http://geelonglandscaping.org/uploads/1/3/0/5/130590153/427753.pdf
    • http://shine-bright-designs.com/uploads/1/3/0/2/130288427/77ca10.pdf
    • http://roselindaalmeida.com/uploads/1/3/0/6/130604952/6623194.pdf
    • http://silascreekrehabhc.com/uploads/1/3/0/6/130620700/b7f6d45a.pdf
    • http://kellyskreationsny.net/uploads/1/3/0/6/130621114/51fcab3f5c185a.pdf
    • http://wwwmanofdust.com/uploads/1/3/0/2/130270894/jidikerujopeviwako.pdf
    • http://babyg-lash.com/uploads/1/3/0/7/130739927/finotup_wiwuzopaneder_laworuputurosoj_gewadono.pdf
    • http://openmeadowfarms.com/uploads/1/3/0/2/130288542/gusivanededopibilaj.pdf
    • http://adelasalas.com/uploads/1/3/0/9/130969116/givatuporofepe.pdf
    • http://futurepeacefulfather.com/uploads/1/3/0/9/130969313/9306730.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_off00005ae5.bin
30375a972d3b2bfc37206cc8e216df875b5657bc626019ffcf8c81f9502310e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE5 6324 bytes

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