Malicious PDF — malware analysis report

Static analysis result for SHA-256 c143851fe2b7e558…

MALICIOUS

PDF

79.8 KB Created: 2021-02-08 23:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c769dadd6b3aecd5f3cf24f10c63340 SHA-1: e6d66c9abe43133bad6767b9f9149cb7e2df6bbc SHA-256: c143851fe2b7e558482350228fded2cbf836888d42ae3a4f0e75e019ed274474
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/aws?utm_term=cuales+son+los+generos+periodisticos+de+informacion'. This URL is likely used to lure the user to a phishing site or download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/aws?utm_term=cuales+son+los+generos+periodisticos+de+informacion
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fcd5dc67d4e6.pdf
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5ffd295a5529b.pdf
    • http://ueuniti.website/bwapp_full_tutorialvttsj.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_6017007973411.pdf
    • https://cdn-cms.f-static.net/uploads/4453885/normal_601e1151f07f2.pdf
    • http://datingdate.site/56294485846pkwsr.pdf
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5ff4c084c3e17.pdf
    • http://vas-rem.ru/getasilor0yaj.pdf
    • http://blue-tick-central.com/mulifajevuxosegewagaysur4.pdf
    • https://static.s123-cdn-static.com/uploads/4505125/normal_5ff0bca5ecd31.pdf
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ff7b51e542ac.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6013cc372f56a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wepaxilex.epizy.com/housework_worksheet_isl.pdf
    • http://gokegufokefewev.rf.gd/hospital_case_manager_interview_questions_and_answers.pdf
    • http://pidezesu.rf.gd/essay_writing_guidelines.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c0.bin
e1224b739ca82fe65d59ae7b84889c57a4356103c7d963eeb5db1f0df0bf7f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 5380 bytes
font_01_sfnt_off00010af5.bin
60ece5320a1d9fc2156ab2b786d61ef5805d3f8f99d5f3761e7ee33ff2aea9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 11612 bytes