Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f8a86be127ffb3…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 22:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48558424d52e38349493c52ccfabe6b7 SHA-1: 29c8384181ec0377cd2dd938fa7fd21b1d3c6d9d SHA-256: d8f8a86be127ffb332a2ce897e62f9b0ed23bed3c0886df95f35591c77c03f1d
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=richard+ayoade+book+pdf
    • https://cdn.sqhk.co/kululojilo/ijIgjij/ultimate_car_driving_classics_mod_apk_hack.pdf
    • https://cdn.sqhk.co/luxixumogez/T7kifDa/ink_master_cast_season_13.pdf
    • https://cdn.sqhk.co/pibusupi/Hiejfgi/mod_iron_new_man_minecraft_1._12._2.pdf
    • https://cdn.sqhk.co/tuxarulenogu/X7hjOl3/hero_defense_king_td_apk.pdf
    • http://gukabibus.mygamesonline.org/20519997081.pdf
    • https://cdn.sqhk.co/wubunepan/ighekjf/emulateur_android_pokemon_emeraude.pdf
    • http://wotedogupowu.sportsontheweb.net/69257605561.pdf
    • https://cdn.sqhk.co/potebuso/hinjhQv/15887225097.pdf
    • https://cdn.sqhk.co/kavuluxaja/hhB0Fjb/whatsapp_status_video_song_app_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovozenamofox/zuvogu.pdf
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_66432d40202d4933b727b421ea2674fc.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_84d2b01cd60f4b13812f49c0ff6b79f2.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_d377e61b830d493dbb3d89b222ffcf7c.pdf?index=true
    • http://zorikeroz.onlinewebshop.net/motorola_pr400_programming_cable.pdf
    • https://s3.amazonaws.com/mexesazaxasa/bodobulowulutasopar.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_off0000f674.bin
36459e93d71d02bc6312578745a9795783c57a94f21add658bdf7ae3cae1a883
pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 5348 bytes
font_01_sfnt_off000108ad.bin
cfaa4ddde7b23e952abef1d5424a82d16584c1cf663f1543eadd9e273df4c3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 12356 bytes