Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a03454894d8d33…

MALICIOUS

PDF

76.8 KB Created: 2021-05-24 21:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 390106252980d96c0c60841921ee6dd0 SHA-1: 22f1caa9889b3acdd61e58dba54f2a59bd9b5d3d SHA-256: 07a03454894d8d33fca0419fb66dbb0620a4702215912fad764cb5b2573d2f56
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the ML classifier and ClamAV detection. It contains a link farm with numerous external URLs, many pointing to disposable hosting, designed to redirect users to potentially malicious content. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=mx+player+pro+mod+apk+download+for+pc, which appears to be part of a scheme to trick users into downloading software. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=mx+player+pro+mod+apk+download+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366399/normal_600e11c55f70d.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/282cc98f.pdfIn PDF document text
    • https://jutifakakunule.weebly.com/uploads/1/3/5/9/135985430/0701b4f46c7f.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/zuruzizipuw-gumodu-lifik-sisogow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418369/normal_5fcc61e14b12f.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/gorudaxivule.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/sobubizalexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2e7edf51.pdfIn PDF document text
    • https://kosopewoxi.weebly.com/uploads/1/3/5/3/135318270/453c903883e2a2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfb50fd-e49f-47b4-86c9-47f55a7e8587/puvuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b872aa-8814-4d92-bee9-1e1960abb434/5862269013.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/35878355108.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/gcse_maths_tutor_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/how_much_is_a_new_honda_civic_key_fob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af57287-f93b-4252-bd4c-bad732d03f27/weber_genesis_cast_iron_grates_which_side_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19759c0c-ea67-4421-bb44-a923f81596d7/fobuxutebetipiveligu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/motorola_ce0168_model_name.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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 5456 bytes
SHA-256: 5fbe98f84f7b352e62b33a548e9a239e3bdf476e67c2dad666c6a881501e7bb8
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10980 bytes
SHA-256: 236de133dd57e8fcf1e5c2a1c927f182c85472aefa104876d078dffc4c15eacd

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