Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f16872282f38df…

MALICIOUS

PDF

67.3 KB Created: 2020-11-12 23:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f423d57aa5114c73888cb66c9ef5e001 SHA-1: 387dccb9cc739d93af030ae693dbfa2bce45970a SHA-256: 22f16872282f38dfa8d9b1474f3005d4819da665b776e16ac85d9cdeeb4b3cce
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary malicious link identified is https://cctraff.ru/strik?utm_term=apdi+pode+mp3+song, which is flagged as a malicious redirector. The document's structure and content suggest it is designed to lead users to external, potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=apdi+pode+mp3+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5f96709e9fb1b.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/ffb27285d55.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/4c655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f8aecae404e4.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/84382a2655db.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/7345674.pdfIn PDF document text
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/a62877ba747543.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/9209089.pdfIn PDF document text
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/dd707f.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/kusavifut_lifadofinutebuk_mudutit_rujinubibeperot.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/72e0acb4-4f6e-4b7c-beca-379c7e1581f4/98609805942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4594ee-222d-4884-917c-4e89f788c71e/wizamasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81f1f0e-7c50-41fa-9649-4247dd7dcb20/62464654185.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_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 5096 bytes
SHA-256: c7e33349ff05fd060dd1c7c360db6fd67b54a86a4330288c3cb251f861edefc3
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10612 bytes
SHA-256: 177ddce791cef07c262fc0005709adcb3bca49fe50f7ae1c811da56384e801c2

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