Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f31849d12be9f2d…

MALICIOUS

PDF

86.7 KB Created: 2021-03-08 23:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25263393a53f97379b743baaa371a42f SHA-1: 784741b67c94973e1752838d2a23b5d47833c61a SHA-256: 0f31849d12be9f2d0d70b0d0f2bd6df881c873621d8f34e0d5288b4fc826eed1
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true destination and potentially distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=meb+faber+the+ivy+portfolio PDF link annotation
    • https://cdn.sqhk.co/woferomot/dicnVxp/fishing_diary_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/igehcji/pewdiepie_tuber_simulator_hack_apk_unlimited_views.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/6ln4ZRK/knife_game_knife_throwing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/2jdxjdu/busisonagotipofaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5ff3276bbbebd.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/jhN5idB/packers_game_stats_vs_lions.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fggXjjC/bufaputi.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dUWhiU5/barber_shop_art_gallery.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/hihidgh/raspberry_pi_zero_pinout_voltage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_604111a38a6e5.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/gQhjvie/download_game_pro_mx_3_mod.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/how_to_write_a_tv_script_uk.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wixubabatoxijor.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/whirlpool_certified_repair_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2059b7-9300-4008-89de-a4d24d222bf6/tobipedavonebabejoz.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/99874478185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cbc98c4-379f-431f-9940-4e321c332793/54935729644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8aa9d2-a2e9-4348-9c42-cb8125fde86e/altec_lansing_life_jacket_2_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b3d595-6d36-4b18-810c-fa590549cb4d/holmes_cool_mist_evaporative_whole_house_humidifier.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/pugafumadaxowepogomikeba.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_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 5116 bytes
SHA-256: 7d9a12910597549d92015c642f6245df7a13a56499c4b33872fb9dd5db78eb4c
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 15268 bytes
SHA-256: 862126d40149c1e3d6f2e736e55b0563f77da796fc400a2c6be7489050c64726

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