Malicious PDF — malware analysis report

Static analysis result for SHA-256 01df4c6489e4dc24…

MALICIOUS

PDF

89.0 KB Created: 2021-02-19 12:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bdbff529aac844ecaad0d3148e8844ab SHA-1: 80842baf9e6158736313e7199a0145a4fadef1ad SHA-256: 01df4c6489e4dc245f58719f4cf7371e57374ca7d8c822657366e77e37d28008
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a mechanism for delivering secondary payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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.
  • 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://bologen.ru/strik?utm_term=wildgame+innovations+terra+extreme+14mp+reviews PDF link annotation
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/6637655.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/Ohijdhc/8271674125.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/g0NDEib/11293813312.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/DidCugd/machine_learning_cnc.pdfIn PDF document text
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/2754058.pdfIn PDF document text
    • http://profaudit32.ru/demolition_derby_multiplayer_unlimited_money_mod_apkaut83.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/mij0hbg/air_france_flight_ticket_reservation.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/kaboxokujuxomokobata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dulizarunagisu.epizy.com/84245582429.pdfIn PDF document text
    • http://wuwusawoviwu.rf.gd/pojuvinenozurisetekis.pdfIn PDF document text
    • http://rumasujosunux.epizy.com/10271866681.pdfIn PDF document text
    • http://relumewamamit.rf.gd/android_gba_open_source.pdfIn PDF document text
    • http://fagemefixuf.rf.gd/sherlock_holmes_1_full_movie_download_in_hindi_hd.pdfIn PDF document text
    • http://somifoviten.epizy.com/fubinume.pdfIn PDF document text
    • http://jabukejezari.epizy.com/uk_visa_tier_4_application_form.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 5440 bytes
SHA-256: f50df79bafa645ad331bb2af72540dd5293a0fcc4e8629cf3fd04f8687de7bd0
font_01_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 10516 bytes
SHA-256: 6e411290139187505afc0f9ca92feef358ab11593502e3d2fd329a27c10aa3a6
font_02_sfnt_off00014869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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