Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f721d777ed90b6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-05 17:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27bbeac5e76c5adf63ba77d242850127 SHA-1: 16d3e405d1a0a4670ef63ffb725f8b8d62288d0a SHA-256: 85f721d777ed90b6c2fbc02f3d0f3a1ff95271e6b277da4eb4964e1f10e61613
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=cuantos+galones+de+agua+caben+en+un+metro+cuadrado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416932/normal_602f2e5cc606b.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/dibztG9/putepemoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_602714c678fe8.pdfIn PDF document text
    • http://mebutef.22web.org/chicken_invaders_5_game_free_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_603d418f2c209.pdfIn PDF document text
    • http://vulifux.66ghz.com/bogle_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fd33a2e5fba8.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/JjbVdjg/poached_egg_calories_and_fat.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hfjbRiZ/real_drift_max_car_racing_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6041b6409515e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5ff608f6d7a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_6015eebf90332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491934/normal_5fcc8e3ac7792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ff2f9dfb482e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_60135aab008e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5fc99d81d33be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fcea744d9002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fffb70dc295e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fd621a7dce09.pdfIn PDF document text
    • http://sofisejulewog.22web.org/jimmy_choo_hd_video_song_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_603e5e7473afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60134b899c93f.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/4gfjgHC/aarp_insurance_payment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipopos.epizy.com/bengali_movie_free_a_to_z.pdfIn PDF document text
    • http://jiporiri.rf.gd/lanilizix.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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 5304 bytes
SHA-256: ad5406ce840c98d252a99083685ea6caef210d119228c2f1e4e13faa29f25d9f
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 12348 bytes
SHA-256: 7c008bbdcdc0f8d3a27f59e23efbabe602a5b02d0fd00caf8cafeee99fed0e7a

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