Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d953eca22dde9d1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-19 03:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a67f8728d67fbb242636a1c2e168ead SHA-1: b8bfe47cf4a0b1a8aba4f5fa2497e825c6ae2f04 SHA-256: 2d953eca22dde9d1e112d7988683da5382259ad08abaec3d75e6a7d7942a3b55
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=black+and+decker+scumbuster+battery+replacement PDF link annotation
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/f1fe31e8c430a.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/4335796.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/dgihjVI/control_center_ios_13_screen_recorder_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/OQ5EXhg/meetme_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/Jq8hgHz/best_turkish_ringtones_2019.pdfIn PDF document text
    • http://pubifirona.22web.org/2010_chevrolet_camaro_2ss_horsepower.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jjcRTha/mini_zoo_craft_app.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/mjagjja/atomic_structure_chemistry_book.pdfIn PDF document text
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/susamorigafugov.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/T8pEIij/trending_hashtags_on_instagram_nigeria_today.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/b78fdf1fb6e3bea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexagulajiv.rf.gd/enhancement_shaman_guide_8._0.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/calories_per_lasagne_sheet.pdfIn PDF document text
    • http://rumejumobu.epizy.com/ninetupojogunebipejow.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/kit_brush_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/what_is_the_basis_of_social_contract_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/dbpower_camera_1080p.pdfIn PDF document text
    • http://fuzakumadobujav.epizy.com/yugioh_card_guide_archetypes.pdfIn PDF document text
    • http://tulafixobokov.rf.gd/evinrude_18_hp_fastwin_gear_oil.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/kavanaugh_report_instagram.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5572 bytes
SHA-256: 94cc55207f614d9f05db05391f2a01802928444166e86de34d6602e178de3d8e
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 11360 bytes
SHA-256: 1543a39fc981364ecda75bbaa1dedc39c8f4c75557df554750f8fea73b9e0dd3

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