Malicious PDF — malware analysis report

Static analysis result for SHA-256 82474aeb0ec14fb6…

MALICIOUS

PDF

67.7 KB Created: 2020-12-23 08:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6d0408c5c7eaa19e2ec29c2a0b85722f SHA-1: 88f89926f25a360ac06977b85b7c3f64e632b677 SHA-256: 82474aeb0ec14fb6dbce256f484747126977332ee979291ce3b2acd695c5358d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and one specifically to a known malicious redirector. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffmen.ru/strik?utm_term=canvas+parent+account+ccsd In PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/torebof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5fce2bd08e627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5fab4fa022888.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/nulogowupijirubonuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fb5476676c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8a8963e00a2.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/5279d.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_5fa5bb761c289.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/tukalavamuratadumup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5fdbb13d36af9.pdfIn PDF document text
    • https://mamamusesutur.weebly.com/uploads/1/3/4/3/134359404/6142244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc50ba1a87939686422cdfb/t/5fca0c2d41142a3c4b44e101/1607076911244/oneplus_switch_backup_app_data.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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 5000 bytes
SHA-256: 00957f347d380a66ac8b5384cd9137e7cddd7c5bf21be82653c8fd70c9d2b477
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 10836 bytes
SHA-256: e732ed798cdbd8271c55ab06f5c16efd1657ca6d64a443abe9711b700135f069

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