Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ea85a98b9c17c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 19:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc6945966b658ab36a7a08e57025fc1c SHA-1: 21074e4ddc53d3576df4b194adabbe97f319d6a0 SHA-256: 839ea85a98b9c17cf0d004d19471911b4617bfcabb034be2b4b980121024a6cf
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 'ponafet.ru/award', suggesting a lure to trick the user into visiting a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=burkert+6011+pdf
    • https://cdn.sqhk.co/bopelara/LWiaRgd/58200770056.pdf
    • https://cdn-cms.f-static.net/uploads/4370540/normal_6033e415365b6.pdf
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6020345c11700.pdf
    • https://cdn.sqhk.co/kutupejotige/2djiOuB/live_disney_movies_coming_soon.pdf
    • https://cdn-cms.f-static.net/uploads/4449603/normal_60207318be3a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banobozibijur.epizy.com/danby_3.1_mini_fridge_review.pdf
    • https://s3.amazonaws.com/tumasun/bafonavinez.pdf
    • https://s3.amazonaws.com/luworizesupox/how_to_learning_chinese_for_beginners.pdf
    • https://s3.amazonaws.com/zakunafu/gatakuledubom.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_ffcf20bfe2994620ababfac5cc518556.pdf?index=true
    • http://nakobebujem.epizy.com/66673124361.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_532b6d114afe400c8990c88663c26d29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce621de6-cefc-4f30-a6de-2bc60da9dcbb/what_is_the_purpose_of_guidance_in_schools.pdf
    • https://uploads.strikinglycdn.com/files/60c070ec-2317-4839-ae97-8b9ce05acf06/bizifududozunalovo.pdf
    • http://vuwepimu.epizy.com/veragenubidupeponivof.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_656d061984d94433a8456f9e4c10e406.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e25ca9fe-f1ee-45e6-9ed5-2547cb57c4b5/zojirushi_bb-cec20_parts.pdf
    • https://uploads.strikinglycdn.com/files/e0d1a01e-7dee-47d9-b67a-7696263d5974/medicare_benefit_policy_manual_chapter_8_section_20.1.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_off0000f3ab.bin
fdbe22dbc4c4d012c63ef160af66131340965988cb300ac2658f812d513422b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5076 bytes
font_01_sfnt_off00010514.bin
8402cc33ca75c4b4ae3696fd59d2994cb7d48bf789261eff3e105e724d325b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 16124 bytes