Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c42f91fcecf60a…

MALICIOUS

PDF

40.6 KB Created: 2020-04-20 09:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b823c5da632186c5a90fd12a6d14271 SHA-1: 3bc22eba68ec2c0ae557408f47f21859182e43bd SHA-256: 98c42f91fcecf60aba8bc305c3610e42540af53ac9daa6d78fb98043e055949c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous external links, many of which point to PDF files on domains that appear to be part of a link farm. The document body text, though heavily obfuscated, contains the string "Meterpreter sam file", suggesting a potential connection to Metasploit or a similar framework. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a link farm designed to manipulate search engine results, likely to distribute malicious content. No scripts were extracted from this sample.

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://adventureinstincts.com/uploads/1/3/0/6/130620274/130620274.html#meterpreter++sam+file
    • http://leadofflabs.com/uploads/1/3/0/9/130969065/255598bd68d6047.pdf
    • http://mjbprolightsandsounds.com/uploads/1/3/0/8/130873941/vizadisekojiz.pdf
    • http://lazymeal.app/uploads/1/3/0/5/130550967/8442363.pdf
    • http://summit-bespoke.com/uploads/1/3/0/5/130546645/nuvibizeluwizobe.pdf
    • http://akifujitani.com/uploads/1/3/0/6/130620340/6666ea9f6.pdf
    • http://sensesxox.com/uploads/1/3/0/5/130546742/xiroriwufa-dudexokotutariz-lunepedozit.pdf
    • http://jaylilrose.org/uploads/1/3/1/3/131379478/7235871.pdf
    • http://ashayeisha.com/uploads/1/3/1/4/131482894/9521837.pdf
    • http://grooveshoprecords.com/uploads/1/3/0/2/130272267/jakogi.pdf
    • http://acs-kw.com/uploads/1/3/0/4/130483527/kogasirepulutikaku.pdf
    • http://colasysllc.info/uploads/1/3/0/2/130289466/gavopi-zilepusa-zaradarolesivi.pdf
    • http://thelicespecialist.com/uploads/1/3/1/4/131407571/e08c65a32a0d7.pdf
    • http://brisquet.com/uploads/1/3/1/4/131438420/gefanubobebe.pdf
    • http://sensesxox.com/uploads/
    • 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_off0000768c.bin
6c16f64c9f896b32a3fb43dc52401d1ea1a1ef3ff55c9ac1650c3f65df9ff87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 8284 bytes

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