Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6810180a29468…

MALICIOUS

PDF

70.1 KB Created: 2021-03-10 00:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2aabd5645f13ff5c9ded1541fb59256 SHA-1: 95e73638daf78639be5439c1a6f58b7b7f926cc2 SHA-256: 4af6810180a294686b5b5804851a4c6649248c15f45bc9dbc587cf54736d74c3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-severity heuristic indicating it functions as a link farm on disposable hosting. One prominent URL, 'https://resalured.ru/123?utm_term=bahut+jyada+video', is flagged as external. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=bahut+jyada+video
    • http://tonimaxuta.iblogger.org/mosobebigaribiguvefoked.pdf
    • http://kavelokafozi.medianewsonline.com/spatial_database_management_system.pdf
    • http://wuxemit.iblogger.org/blessed_quietness_sheet_music.pdf
    • http://jemulobapamiwu.mywebcommunity.org/17113893814.pdf
    • http://rusewigojubilon.mygamesonline.org/sell_back_ati_nursing_books.pdf
    • http://xomutukegadoj.mypressonline.com/samsung_aqua_jet_vrt_smart_care_washer_parts.pdf
    • http://fowagovujag.22web.org/wanilaxoxituboliwutewog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c2e1479-cd52-4be2-9d2d-81bba48b6856/jileloti.pdf
    • https://s3.amazonaws.com/jinabom/radix.pdf
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_33a0e09e3a58429bac82c2b4c6d1c267.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_5b885fea631642d4b4f2022a08ae0a60.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_fe6afa87059044acbf723ee2db7ba4d9.pdf?index=true
    • http://nozuwodapa.epizy.com/56743413306.pdf
    • http://baxamudixilado.rf.gd/jifuxiboz.pdf
    • https://uploads.strikinglycdn.com/files/849173da-3110-4d49-9560-326f12f57e45/xuxiwelufuzotijox.pdf
    • https://s3.amazonaws.com/tumuzu/zexapagapibuwez.pdf
    • https://uploads.strikinglycdn.com/files/c517c486-d5d3-4b80-96e3-518f0f0aae66/pewidimasinun.pdf
    • https://uploads.strikinglycdn.com/files/7566fcc6-cebd-4d13-8b58-afbb215d3e89/fadowajepubakakelin.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_5c5e36067e6d4acb98c7fac01b1f67b4.pdf?index=true
    • https://s3.amazonaws.com/xowasosuf/hokey_cokey_free_sheet_music.pdf
    • http://topowurarasixe.epizy.com/42409135943.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_235ed5fff25a413fbd0204a5fc54610a.pdf?index=true
    • https://s3.amazonaws.com/mukut/asoka_full_movie_mp4_free.pdf
    • http://jodonurinifos.epizy.com/film_besharam_full_movie_mkv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e2.bin
29e863251c410d728c4b43d4f04e0a48211860d8073f94efc027c0b2650d4d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 4896 bytes
font_01_sfnt_off0000e79d.bin
4b72df9738b89a67e02db5ef78de5fa9c1ed940a9b2b0b95201d3fd2e04c1a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 10528 bytes

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