Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01566c42ba8c329…

MALICIOUS

PDF

76.5 KB Created: 2021-03-11 23:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e83c36b1154b276d1883f5379f813349 SHA-1: 5902ca294d81e05af31a4cae5465ed20ab43466e SHA-256: a01566c42ba8c3290671a7696952bc5d7fcf9d02dc3a1e416c7ce85f2f29589c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=richmond+water+heater+trouble+codes In PDF document text
    • https://cdn.sqhk.co/baxotonad/ijZTUii/joker_ringtone_download_pagalworld_tik_tok.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/jjXXLij/capture_the_flag_movie_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jcIhdif/human_fall_flat_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/heDUyji/best_murder_mystery_games_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/cJgewjc/game_of_thrones_ringtones_for_android.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/zudubamotadakim.pdfIn PDF document text
    • https://cdn.sqhk.co/buxoxurobewi/wVaCgf9/audio_pro_addon_c5_vs_sonos_play_5.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/jagfQPN/zowakeporixiselava.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/wesidijotugapi.pdfIn PDF document text
    • http://gijixig.22web.org/spoof_call_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/Zjhggih/witapukiwuroji.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/Ogiiggh/37822187722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_49d4445d64e34226b25580cbb732104f.pdf?index=trueIn PDF document text
    • http://sisigetevi.rf.gd/bubbleupnp_license_apk_cracked.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_9614ac894c8f4e7ebc299977d4f1a707.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_cb9a4347e6dd4dae8184ea3f28fd8913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panokojol/agsb_sixth_form_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/jegomipupewudifoxipebel.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_45381db734e047859cc4c786996c2084.pdf?index=trueIn 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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5420 bytes
SHA-256: f564468d68cecb0211fdfb5e7d98b3e7de8125d5caeebdeae95b17017a421eaa
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10788 bytes
SHA-256: 22c2b3d35fdf9c384148869428d05f5bedf2180ea8679f6450332037d63da866