Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde1f99754282ef8…

MALICIOUS

PDF

75.7 KB Created: 2021-02-17 05:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6589f0ae459128f00ee9b8b3a22e88d8 SHA-1: 0cecae0f4fbbe5b1588b962d8a41dbc530f057d4 SHA-256: bde1f99754282ef836e978f9615506cad899162a78c5e6cf4a769adf253ee87c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a title related to relationship advice, which is likely a lure to encourage users to click on the embedded malicious links.

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://jacksth.ru/strik?utm_term=how+to+gain+trust+in+a+relationship+after+cheating PDF link annotation
    • https://cdn.sqhk.co/biwizalibe/d6W2ehh/pixel_art_creator_website.pdfIn PDF document text
    • http://present-mag.ru/ziwedejofivafudoverukezvby6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5ff425e55a6a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_600c856cdf7fe.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/xozuleresir.pdfIn PDF document text
    • http://reduslimitaly.website/chrome_sign_builder_guideljwf8.pdfIn PDF document text
    • http://cetly.xyz/sekiro_isshin_boss_fight_guidel7dq8.pdfIn PDF document text
    • http://trynon.xyz/what_are_the_8_teaching_standards96io3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fe13637e11c5.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/jujamonibewum.pdfIn PDF document text
    • http://budijam.iblogger.org/zuxig.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/5218893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reratosagozi.rf.gd/mepedunes.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/zoruxogorasedixu.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/man_made_calamities_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/drawing_grid_template_free.pdfIn PDF document text
    • http://navorusisuwo.rf.gd/bhai_bhai_movie_hd.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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 5332 bytes
SHA-256: 68954c027cf7e8ecbee5240823c0062468e53fe20960a95cc200745d7a242eba
font_01_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 10784 bytes
SHA-256: c6a846cf75dba16426bee7c5d8ee2aa7423a10e0a39e80c1b9d89a6be485a5c3

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