Malicious PDF — malware analysis report

Static analysis result for SHA-256 24873d0d1dd89042…

MALICIOUS

PDF

77.0 KB Created: 2021-03-01 11:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 913615b47309bbcf15cb7b7373517490 SHA-1: 229b078caaaa3b6f15cfd15454834d49cbf80920 SHA-256: 24873d0d1dd890420b7acce709cde2a00873a40ce9ff940b09fae23e8dba710b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'dafemum.ru', identified by both heuristics and ClamAV as a phishing or trojan distribution URL. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded link suggest it's designed to lure users to a compromised site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/award?keyword=the+mortal+instruments+movie+trailer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_60297336218b5.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/g1hcehf/love_story_chords_g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_601b87c848f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_6011f0f87f570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6020d22021c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_602637c75432e.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/sthdhhB/tomevofavakonovosonot.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/heAijhf/yummy_potato_cubes.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/NGYgfhb/defenders_of_the_realm_an_epic_war.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/hbighje/61801072536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5fdfa8d39ab7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5fe0a2d820a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_602d92d99a7cd.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/iefNeGI/nasa_federal_credit_union_ira_cd_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/tgivjjf/47379769416.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/Uighijf/mideratutoloberaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_5fd054ee332bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 4932 bytes
SHA-256: d441da2668b8d8e0ec8c85f4bfa88d3867a60ce856fe4520f0a233709bb2fe1e
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 11000 bytes
SHA-256: 137bcd70f1d1609f7eaa93d6dab30368b202fb0b92956013cd9c006dda511f90

Open this report in the interactive analyzer, or submit your own file for analysis.