Malicious PDF — malware analysis report

Static analysis result for SHA-256 c978da7c0cae5a88…

MALICIOUS

PDF

65.5 KB Created: 2020-11-20 16:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5b9a39b4c7d18fc74cfd252c7a5f9621 SHA-1: bfa52df757fd3f09d40968b66197874158680d56 SHA-256: c978da7c0cae5a88bcec84f5adf2daeb2fad2a2e934ac2499768bd2935b1a391
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=twin+xl+bed+sheet+size+cm PDF link annotation
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/905156.pdfIn PDF document text
    • https://vezupololepabuk.weebly.com/uploads/1/3/4/6/134600483/20033f93.pdfIn PDF document text
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/7560031.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/dipameli_latet.pdfIn PDF document text
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/7751553.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/4336234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/jedaxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcc5337-12ae-491b-a994-e9225fbd5264/historia_del_cnc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25d538b-208f-4afe-bc54-5e1e93b8bd69/tedemizowizozupilevel.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mesotelioma_seram.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sugelotixixederojisuxe.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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 5172 bytes
SHA-256: f87e420dd283409bdf400761b6f354194e30a3f9e844b307ea1143770825d552
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10484 bytes
SHA-256: 34e85eed331e6612b774d8b6693832f7b014a2bc725a9110b6418803207c0806

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