Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8c4a735d1e0532…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 22:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4f9d784f7de2cf4e0d1e67e5146ebea SHA-1: 958ed09dd6b7ff59ae761a96170721977de9667e SHA-256: 1a8c4a735d1e0532d564995a700d80062913bea63cb69fd2ee1b892743e85e48
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=google+apps+and+sites+%2528like+search+and+maps%2529 PDF link annotation
    • https://cdn.sqhk.co/tavimuxeju/ietnjb8/95346373675.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/kicIhhb/merriam_webster_dictionary_pronunciation_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_60641f3540388.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/SjageDS/snakehead_parrot_fish.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/Xibihgd/tiny_wizard_idle_clicker_tycoon_game_free.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/jarumabipos.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/66d88837b1.pdfIn PDF document text
    • https://cdn.sqhk.co/birifoneboj/gjfgdHy/midokokutegonipuvogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_605d20e4bec99.pdfIn PDF document text
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/janozunoja_nuperer.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/gijiJia/best_motorcycle_adventure_riding_pants.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/ibhdBud/bijowozilekipibudumuvup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://febojuv.epizy.com/pizokifozego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2447e0f8-7314-452c-b128-46fa70c0aa55/26599549665.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/gamubemodoxumeroti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb64468-6370-4e42-8487-f5019318f220/covid_19_risk_assessment_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65986041-1734-439d-af3c-47836837d645/32359177044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6f2c19-f9e0-4161-a47c-c8b6ff046361/can_i_install_my_own_satellite_dish.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5736 bytes
SHA-256: 9e1934f08b4b81e3854205484193ab577dc3648448dbc4828195c785292304aa
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10736 bytes
SHA-256: 5efae9d263df8afb1ef41a05e538a1ea8308b299c7da9635684c0cdf7737519a

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