Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2672a97b3aabd52…

MALICIOUS

PDF

70.5 KB Created: 2021-01-25 12:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f5ceb570272c2e5fb39d31c6fd3e54a SHA-1: 39ac29492fd8b9f033712beeffdc6e3604499e52 SHA-256: c2672a97b3aabd52bcdf59f9de4f91c2be69a66a80d46e1b0c90c3a44525fd4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

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://leonvi.ru/123?utm_term=ainz+ooal+gown+death+battle PDF link annotation
    • http://osthondroz.com/24443645085x3qzk.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jfDrgc1/top_free_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/gg6jiNO/55101378210.pdfIn PDF document text
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/roxozutewavetel_makeleb.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/8d0423528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_60012aafa4326.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/lanos_mapasur_madidutuwete_rodapusizegag.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/ccKjc6W/finopi.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ihdjiYt/85941226142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5fdaff6c70904.pdfIn PDF document text
    • http://twirlini.com/tulesutaliib9.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/cjbhia4/scooby_doo_movie_zombie_island_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5fe1427a83e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600e48b63b8a5.pdfIn PDF document text
    • https://cdn.sqhk.co/govuzupikiwe/XYCvnXp/cafe_racer_motorcycle_for_sale_bmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/arjun_reddy_movie_background_music_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/wutelamazijagig.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/sakewewi.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/37383956814.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 5084 bytes
SHA-256: 2f69021523df9b2c2b8ec863f958a92184d102cb9d64e5d61aceea95cb17c6aa
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10352 bytes
SHA-256: 1f3aad8142db0ed52e67ba470a4e35db7614217546b0762995b84ee1f46bd4b2

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