Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22e49f8390b4272…

MALICIOUS

PDF

74.4 KB Created: 2021-03-22 10:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f0165a036cf6e21655ef16af7667b8a SHA-1: caddc96a557df5a08484ac7978e086250716ea63 SHA-256: b22e49f8390b427264dfbfa4d74507d358a85fc2c884e230dda5cc77891a48fb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain metadata related to a user manual, likely a lure to disguise the malicious intent of directing users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=vitamaster+clubmax+exercise+bike+owners+manual PDF link annotation
    • http://faceskinagainbeauty.xyz/32404967132o145r.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/72021374268.pdfIn PDF document text
    • http://sefajoga.iblogger.org/lagu_betrand_peto_kau_takkan_terganti.pdfIn PDF document text
    • http://community-day.ru/letulilomizu3tl8i.pdfIn PDF document text
    • http://tevalevas.22web.org/powedaliv.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/aircraft_structures_david_peery.pdfIn PDF document text
    • http://fitdieta.com/human_touch_massage_chair_replacemenr2j03.pdfIn PDF document text
    • http://dajexori.mypressonline.com/masterbuilt_30_digital_electric_smoker_recipes.pdfIn PDF document text
    • http://thestablestl.com/fokuredudotitismmo28.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/80891335796.pdfIn PDF document text
    • http://mybestchan.online/wiwaxokelomotemusetuaol3k.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/breakfast_nook_building_plans.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paxubar.rf.gd/declaration_of_independence_questions_answer_key.pdfIn PDF document text
    • http://neluxiv.rf.gd/95839802159.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/weber_grill_grates_spirit_e_310.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_9708264f315d43ca975e1355100e7972.pdf?index=trueIn PDF document text
    • http://fixuwadifuwifos.rf.gd/rofej.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/christmas_gift_guide_for_him_2018.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_20cc186c851b47f793ac0a663cd058f2.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_aa8e1b9e767f4987a2dbbd818125612e.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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5276 bytes
SHA-256: 51d4dd8610183b06c95f7a71eb5b325e6ecd7763a69d50b5fb45f94ef3fab775
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10388 bytes
SHA-256: 060fe45d225b034717ee3ed338cd5538fc19a74f4cda75e922a63c8ad539cadf

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