Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c89df5fade3a7c…

MALICIOUS

PDF

81.5 KB Created: 2021-02-13 04:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d9a0a9b2c3efdf3951e981d3152babf SHA-1: 59199ce17e1f24cdd65dbb6cf67a46a68a098187 SHA-256: 57c89df5fade3a7ca7af596b030c860d866b314acb51a9d4ab21073d06b2d5c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://druttle.ru/wix?keyword=deadly+intentions+lisa+harris
    • https://cdn.sqhk.co/vafodagusun/QjeNgi3/piteneva.pdf
    • https://kewejoxenolubur.weebly.com/uploads/1/3/5/9/135966954/3585168.pdf
    • https://cdn.sqhk.co/resilano/6bDiiib/tenubesowede.pdf
    • https://cdn.sqhk.co/komajekolino/hiifidZ/xoguretixedolege.pdf
    • https://static.s123-cdn-static.com/uploads/4418557/normal_5ff16eb111449.pdf
    • https://cdn.sqhk.co/letonolomo/rVogdjh/29150889306.pdf
    • https://cdn.sqhk.co/derebeduno/hh4mxhc/dizefizifesapefogive.pdf
    • https://cdn.sqhk.co/julubesaf/0ibQhhr/tuxixuluzisozowivig.pdf
    • http://kekasot.22web.org/64503900012.pdf
    • http://dobewobezusisof.iblogger.org/fufifi.pdf
    • https://static.s123-cdn-static.com/uploads/4367646/normal_5ffc725eb46c7.pdf
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fe48190056cd.pdf
    • https://cdn.sqhk.co/wifinalimow/gTJ5Tjc/beach_buggy_racing_mod_apk_uptodown.pdf
    • https://cdn.sqhk.co/jokalirubore/dWigthf/guns_of_glory_alliance_teleport_not_working.pdf
    • http://fapumew.22web.org/xedepuvijaxefumare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jenigaseze.epizy.com/aladdin_als_monitor.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin
08cba0291caf210db927630f7b330aed2583990d0f8ea54971313aaa242372a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 5012 bytes
font_01_sfnt_off0000fffe.bin
5ab18403968369f2dc8a461d37a4de8775a8a72397204f4c3b96a395d8d1c948
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 10080 bytes
font_02_sfnt_off000122ba.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16312 bytes