Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b24b6d4f6ea7cc…

MALICIOUS

PDF

81.3 KB Created: 2021-05-05 12:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c9183aeefea3e6c10e2759a8738f523 SHA-1: 7746548cc97f1fb54cafcd6cd7f331bdcb0dca4d SHA-256: d1b24b6d4f6ea7cca98b563adfd1c4bb9c2e5accdcda17c405eff0ec6c981eee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary URL, https://jumiwimov.ru/strik, is likely used for phishing or to serve a secondary payload. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=asp.net+mvc+5+tutorial
    • https://ketizinuxemuwiw.weebly.com/uploads/1/3/0/9/130969628/baximi.pdf
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/776695db.pdf
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/474073.pdf
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/b9c7e5bf5fda287.pdf
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/c06a19163ce32.pdf
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/kolidelomojego-niwatiripe-totaxazefus.pdf
    • https://bikizulotozenap.weebly.com/uploads/1/3/1/8/131860645/8958473.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/kaforidevabu-fidonem-wofagidoted-zevubaz.pdf
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/0e468c5b05.pdf
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/tebinuriginuwata.pdf
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/vigosulekipop_gapoxik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutezigojuxi/direct_indirect_french_rules.pdf
    • https://s3.amazonaws.com/wufujudisu/la_vie_en_rose_full_movie.pdf
    • https://s3.amazonaws.com/xozeb/kosorazagukosi.pdf
    • https://s3.amazonaws.com/zunaduxa/87419317750.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_d67b1277fe8d4b20b9591621283fd582.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/7_branches_of_philosophy.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_6d146ffe30a042b6993949af7adc5356.pdf?index=true
    • https://s3.amazonaws.com/novipaliwid/harumanis_mango.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/monster_vs_aliens_characters.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_off0001011f.bin
e87045657a49042be5194e512b512272e99e7e2ed4e0a2757599d6373743670b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 5284 bytes
font_01_sfnt_off00011311.bin
6dc17fbd250885c10e52cc0e16a20b21a98e92f1fe72687637bc0b2d7dd44e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 10976 bytes

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