Malicious PDF — malware analysis report

Static analysis result for SHA-256 81113cd8c435a81a…

MALICIOUS

PDF

68.7 KB Created: 2020-12-25 22:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f0a3c96b3e32f981ca43ceb2346ce2fa SHA-1: 126cb15d7dcccf6e8523f15ecde9afcdb861cf85 SHA-256: 81113cd8c435a81a7df03a6684cbb44b691e37947634788319697cc4c1310955
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=poetry+anticipation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fa7ee0e73612.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/7qkgg7B/mevasofi.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/hBZ3ijC/words_in_a_pic_2249.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/jihgjd8/formation_sur_les_automates_programmables_siemens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fa18caa5be4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9146258f-4a09-4570-89a2-da1c0a41632b/crt_tv_for_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3185b0-3c00-42c8-90f9-3103d7ae01be/monster_strike_apk_fr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f55d501-8eb4-4691-b371-7f38ca0b7411/fiwipimabapupav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca4510f-ca36-44c0-b14d-63671bbc32d2/69172323829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e8b7ea-5f73-409f-8a32-d019281ceafd/2571142519.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/la_luna_sangre_july_12_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/actos_administrativos_concepto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e491e192-0d9d-4f7d-99f7-3a068c91ce5e/holiday_inn_baton_rouge_airline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94976a4b-43b9-4de2-9773-d9ab6c09b921/la_leche_de_soya_ades_engorda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 5016 bytes
SHA-256: c5d52a174202e24ef540ef4154dd29444510b3e70240cb4bc71acc0edeef919a
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 10008 bytes
SHA-256: 5a22e76fe0bd412453d817732ab06a9632bf7f0d8c70e08cdfb6ed8d7ffc7bfc
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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