Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f38893ba69c720…

MALICIOUS

PDF

81.1 KB Created: 2021-03-12 17:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7fb079e73c7013cb9a6c179ab80f607f SHA-1: eff0ba4ebcb9f6aa8606ec6be0dce9c6a3bd6b8f SHA-256: 53f38893ba69c720e6ca2df9371a72b092a9eb1307b6c91fd51e41fdb4c22bc0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=linksys+x6200+user+guide PDF link annotation
    • http://argo-tourism.com/black_and_decker_edger_instruction_manuale8jm3.pdfIn PDF document text
    • http://repair-foto.ru/coaster_frenzy_apko4kcb.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/geggehe/mine_blast_game.pdfIn PDF document text
    • http://btsworld.org/glitter_wallpapers_for_my_phone900at.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/WYhh60T/loxuj.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/ifNjfvh/fevuvujuxemixopipelivozo.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/cC4Jgi1/archery_world_cup_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/Ggjjggd/telumevomus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kisagoz/sap_customer_success_story_template.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_59207cb16ecd4bec8eafd223b282e78d.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_00fc87a22e564064b4591048ac679eaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef3bc3e-8a51-46f6-8a87-0064407a904c/how_to_use_bestway_flowclear_filter_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf0b0a1-4e4b-4c32-89ce-32333b7b6c54/detox_plan_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edbc639-67a5-4813-a9b8-1cd1c9cdb64c/fiwosugafutimumoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75532db3-a9d6-4bba-8ae8-07dda9c36609/how_often_bodyweight_training.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/13261072972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd6d3ad-bfc4-4292-b126-e9c5f55dfbc1/how_do_i_know_when_my_sportdog_collar_is_charged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444a8da3-9578-4557-8939-89eaded133e4/boss_tu-3w_chromatic_tuner_waza_craft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a4c212-2efc-4e61-8265-0425a28ad57c/duxesupolozije.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_990f9076035e4b3bae11a21cce3c9e62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/95264799488.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 5044 bytes
SHA-256: 934188bbbd75d56a48b197a5d8929f42ab3de7425ce53a54d1871947e0b8541e
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10412 bytes
SHA-256: 9fb8feb254ab4d5b77fdc76b53dca507c4efe166a18fc6fdcb95d5f9a0fb5191
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378