Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d3ec15f0f1c566…

MALICIOUS

PDF

83.9 KB Created: 2021-03-06 13:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: abca5e8f2a0d52a6ba1a4782200545f1 SHA-1: fae3042ed458d4de90164a41dd12ec281ac00f3c SHA-256: 61d3ec15f0f1c5665d50bb40cd9603480e55995723cd0918a939ba93ccc812aa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into visiting these 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://bologen.ru/123?utm_term=algebra+with+pizzazz+did+you+hear+about+answer+key+page+89 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fe63b5a8f839.pdfIn PDF document text
    • http://vuvuga.xyz/16602803006is3xl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_5ff2f10135ccd.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/SRhcigb/prison_empire_tycoon_idle_game.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/is_the_jeep_srt_reliable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fe7fb3faed99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_602f9560b67b7.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/Djb6Egh/my_plants_evolution_your_pocket_garden._com.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/5942276544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6018ef690def9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcf9be8383bc.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/ijchfif/dubai_airport_hotel.pdfIn PDF document text
    • http://topdouche.xyz/ismart_shankar_dj_songs_remix1i5nv.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/imjePnC/super_dancer_2020_contestants.pdfIn PDF document text
    • http://vinograd.io/darth_revan_gear_spreadsheetyut9z.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/fr8Mykh/war_of_the_worlds_1953_full_movie_dailymotion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxuzoto.onlinewebshop.net/20512942523.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/proving_triangles_congruent_sss_and_sas_worksheet_answers.pdfIn PDF document text
    • http://diwiludoki.rf.gd/fexagewenufawopo.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_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 6008 bytes
SHA-256: 56625a0d83ba268ec7c5a589fc5d3c2f796925dc843a248eb8018b9db12da63b
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10020 bytes
SHA-256: c49132fd4bda675fbb77e9a48dff0be604b7ca6f567b11979b66bfe91bd3d0b4

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