Malicious PDF — malware analysis report

Static analysis result for SHA-256 669196bf211a1935…

MALICIOUS

PDF

71.7 KB Created: 2020-11-25 23:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5dbaf0cda7d58e41e4aa1164a700a8ae SHA-1: 2c8805387873211e43960948c91aa46a77618c4e SHA-256: 669196bf211a1935c3ce5829fa26e876971496d98b351ad911020d0134f4fc2b
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a direct link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content, potentially for phishing or malware distribution.

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
  • 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=natural+muscle+relaxers+over+the+counter In PDF document text
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/cb9a1f678ef8e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5fb4944a3c7d9.pdfIn PDF document text
    • https://fiwuvoreguno.weebly.com/uploads/1/3/4/0/134000104/sisegumos-tewux-zejemup.pdfIn PDF document text
    • https://visemuturivawo.weebly.com/uploads/1/3/4/6/134673250/xozulowi-kibeximuxiseji-fusasebagaso-tukanobugotenom.pdfIn PDF document text
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/savum.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/roxojegumelujav.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/1eeb26fa953bc0.pdfIn PDF document text
    • https://lusefova.weebly.com/uploads/1/3/4/5/134583673/kureluwasixume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5f9cf60c31998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f9c2ec2296c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8f3651224ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5fa793dbec4d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5f9e7fc009526.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/c4428a92-1716-48e8-a70c-ea559c67d667/buwurisuvaveraposajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6938d79c-7184-4d92-8cd1-f5c0008f7c5b/sizikalebemavolopa.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5136 bytes
SHA-256: 34e678fd5c16cae1bb30e4662aef8ffde9f03f96cdc0a591f35051e2efc323ab
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10428 bytes
SHA-256: 85c424d72978b610d74866ae255bb2ffe93e2333a72dccde2c5f2bf063639ecc

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