Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9f46361a504466…

MALICIOUS

PDF

71.6 KB Created: 2021-01-18 01:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d8bba5e9dc6190fc15f660b293092225 SHA-1: e33931437c355da1e7f83746eae6f91ee3545dae SHA-256: 8e9f46361a5044663fb6f85ca3f3b90b2a3e436b52e6171097d52d9e456b9507
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to its creation, which does not directly reveal the attack vector but supports the overall suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffnew.ru/aws?utm_term=a+thousand+years++pagalworld PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5fbe0a114f1eb.pdfIn PDF document text
    • https://site-1230430.mozfiles.com/files/1230430/fukiniwebufelotewelodoma.pdfIn PDF document text
    • https://site-1171498.mozfiles.com/files/1171498/lucky_knife_2.pdfIn PDF document text
    • https://site-1176040.mozfiles.com/files/1176040/kaviwuj.pdfIn PDF document text
    • https://site-1177743.mozfiles.com/files/1177743/dunkin_donuts_gift_cards_bulk.pdfIn PDF document text
    • https://site-1181076.mozfiles.com/files/1181076/80_s_songs_to_dance_to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5fb80c0159205.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/sample_curriculum_design_template.pdfIn PDF document text
    • https://site-1178820.mozfiles.com/files/1178820/31826241361.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/pumuzedabuvamobe.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/fjcJjdd/btd_battles_mod_apk_unlimited_in_game_money.pdfIn PDF document text
    • https://site-1179802.mozfiles.com/files/1179802/lombard_risk_agilereporter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5404 bytes
SHA-256: 511bdd6d82fbb147fe858014e585e569401f65f63c6ff8ffe137453d5b87bf2b
font_01_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 11928 bytes
SHA-256: c4bdfb3064e54240dd4f08f665c1e24ea0bf4b31fd38d65fd4f5dc01f15ec88d

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