Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34e92cda24845d7…

MALICIOUS

PDF

70.4 KB Created: 2020-12-31 18:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76d0194da69caf7d12a6d86035742ed SHA-1: d91b6d177888b12ad07319cdaacd34797fba0510 SHA-256: d34e92cda24845d77c6acabf0c853a2bfbbbfc805fdbdec0df976cae7b40b6da
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a primary external URI pointing to 'traffking.ru', suggesting it functions as a link farm or phishing lure. The document body is heavily obfuscated, but the presence of 'wkhtmltopdf' and 'Qt' suggests it was generated programmatically, likely to obscure its true purpose. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=piano+keyboard+notes
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fbf140008b62.pdf
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/8536347.pdf
    • https://gidujufopotadav.weebly.com/uploads/1/3/0/9/130969470/baposonomexexipi.pdf
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/resumetumuwu.pdf
    • https://boburebapexew.weebly.com/uploads/1/3/4/5/134597485/rokula_pedejo_xawovunak.pdf
    • https://cdn.sqhk.co/rewazexi/igojeoD/rutuwax.pdf
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/6edc05b5acc161.pdf
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fa3aeab7af12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/690a2090-2f11-4f1d-8aea-dc3d8e435db3/zudidodulunonen.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/86220187651.pdf
    • https://s3.amazonaws.com/zarelusipofox/simple_past_tense_exercises_pre_intermediate.pdf
    • https://uploads.strikinglycdn.com/files/b04b95a8-4c98-4290-bad5-7cf72f90c215/assessment_in_education_examples.pdf
    • https://uploads.strikinglycdn.com/files/b7bdce81-8708-4b85-b9a9-0526620d790f/bagexutesugosakur.pdf
    • https://s3.amazonaws.com/nemafu/rowdy_baby_mp4_video_free.pdf
    • https://uploads.strikinglycdn.com/files/39693f9e-d8a4-4c42-aefe-88ec49833a15/stick_insect_meaning_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/e55aaf32-736d-4ecf-851d-b3034114e183/63711044700.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d528.bin
1bfca96a0956a2b020e020d03e3dd61d2392834383235febea2f9c76e21473e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 5092 bytes
font_01_sfnt_off0000e68e.bin
4cd5b7783c79c75eba98aa0e8110262b0d08f9e54741ac3703ec524deffd15f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 11092 bytes

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