Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4beba81f155836…

MALICIOUS

PDF

74.0 KB Created: 2021-02-17 17:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d20e28bf08df883f30bc9a07abc80f1a SHA-1: 1f1353f89c23a60f7642915db554eeb2e8f95716 SHA-256: 7f4beba81f15583641a0c91e918110984cab3b6ce265024dae86ec2097ea2bfa
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into clicking the malicious link.

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://maypoin.ru/wix?keyword=commas+and+semicolons+worksheet+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412388/normal_600e052f588e3.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hhDgcie/skiddy_car_apk_download.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/mamma_mia_piano_sheet_music_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fc950d501027.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/exOQ9JW/rexazenixosa.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/BhcghSy/xazowaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5ff683861617f.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/qie6ig1/download_game_drone_shadow_strike_2_mod_apk.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/nisoxow/86012802882.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/36989022077.pdfIn PDF document text
    • http://regenazuwirege.epizy.com/lagu_betrand_peto_sahabat_kecil_ku.pdfIn PDF document text
    • http://tubupokus.rf.gd/gurenujasonat.pdfIn PDF document text
    • http://rakutekapo.epizy.com/video_recording_software_windows_10_free.pdfIn PDF document text
    • http://dufogatate.epizy.com/rizuritinodukopoma.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5240 bytes
SHA-256: e1ad51ddd59d493bbef36a45c51e33aa19017e79aacd5d726f2418d75eac5531
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 9932 bytes
SHA-256: 7139c32a930016b539d9a5f8ea0a2add8215467e55bd982eebbfaa8650b702d3

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