Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5263b28e5f2b369…

MALICIOUS

PDF

68.0 KB Created: 2020-11-18 14:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13963313c26cb783aa26c805f0ce4e8c SHA-1: 3f308fecefa0029319f5c0c9b5abf57c687a6c78 SHA-256: d5263b28e5f2b3693a9ff14e954d6aac097841ba94a5a1ed4f6459b1f79806b3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?utm_term=como+hacer+pozole. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=como+hacer+pozole In PDF document text
    • https://kesamitowusiniw.weebly.com/uploads/1/3/4/4/134441112/8585194.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/muwotula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_5faf28311c1d8.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/c17e4e2acff3c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fb4228d8eb9a.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/7627051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fb2e8da19940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5f95243462aa2.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/3920100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6c88d0-2d6e-4e49-b859-d7757ebca9d6/92553716433.pdfIn PDF document text
    • https://s3.amazonaws.com/goporo/can_t_activate_showtime_anytime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53469b39-1e50-4465-85ae-8b6bd0ff2187/70320935129.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/lafufitubotameli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa654d09-ea48-4470-93ad-e78417ecdbf9/terraria_lihzahrd_temple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6616fdf9-65a1-4304-ab5b-fe779f4fd60e/zepanasaraziposefitar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 4948 bytes
SHA-256: 0dfaa0c0aeb29d1010d2f3e604b5522810f71930fd132bd36e510de73286b4c4
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 11012 bytes
SHA-256: 45ccbbca96fe5961a9c843ef9c2c1946e5c6586fee9c3ad773b3e0b00f1ff948