Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0e2c22d04d5f66…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 03:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab670eb7040efe22701e40933f64edb SHA-1: 5b08e1762da335308db44e9869b53976801f5797 SHA-256: ef0e2c22d04d5f666e205de91cfe9dd1a0c6c2220ae1029d4ddb55e3934d7fd4
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF as malicious. The presence of numerous links on disposable hosting suggests a phishing or spam campaign aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8479

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=building+winning+algorithmic+trading+systems+pdf
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fe964bd9e1a3.pdf
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60152f4a5857e.pdf
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601d8417e50ac.pdf
    • https://cdn-cms.f-static.net/uploads/4503050/normal_60362cd61340d.pdf
    • https://timigotevawil.weebly.com/uploads/1/3/5/3/135329967/rusofelijilopexobibu.pdf
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/nepimezelexa.pdf
    • http://bonozowibewoz.mypressonline.com/bihar_board_10th_syllabus_2020_download.pdf
    • https://static.s123-cdn-static.com/uploads/4366347/normal_5ff2a7972c977.pdf
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/webakimurifewim.pdf
    • http://tetoxukipim.getenjoyment.net/medical_experience_certificate_format.pdf
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/dadinimaze.pdf
    • https://cdn-cms.f-static.net/uploads/4490953/normal_60494565ad6ae.pdf
    • https://pirikanupixiro.weebly.com/uploads/1/3/0/8/130873781/cb843.pdf
    • http://xifamopituwoti.iblogger.org/vilazidemu.pdf
    • http://folugomobok.getenjoyment.net/ethical_considerations_in_business_research.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gemivaf.rf.gd/free_beetle_drive_templates_print.pdf
    • http://disupenepoka.epizy.com/30240414081.pdf
    • http://napamewa.atwebpages.com/bible_new_testament_books_list.pdf
    • http://vewitemagim.rf.gd/assembly_language_programming_8051_examples.pdf
    • http://jadukubilelib.myartsonline.com/cooperative_argumentation.pdf
    • http://fajazimigig.atwebpages.com/why_wont_my_gas_fireplace_pilot_light.pdf
    • http://zipemoluligera.myartsonline.com/gedolobe.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd40.bin
01ccb93646ed78fb521320827b74f9bc3f7ea876dcbc469f34843830151ac924
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 5812 bytes