Malicious PDF — malware analysis report

Static analysis result for SHA-256 7958fff25b042cd5…

MALICIOUS

PDF

83.2 KB Created: 2021-04-05 16:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c5cc59a8648582c03f0fa5ad6e5c1e2 SHA-1: 88f00bfed2083fc641b91fab729d6608ecee0f53 SHA-256: 7958fff25b042cd5734f9e124caa32e88e9e427e8b896f277e82d4d7123a6adb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on potentially untrustworthy sites. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=achilleid+stazio+pdf PDF link annotation
    • http://subbellassecret.com/musapovude8r9jl.pdfIn PDF document text
    • http://peludofnor.fun/can_i_talk_to_a_real_person_at_fedexq5slo.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/yQ5ijjd/78412319664.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/xagilori.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/iY0hiic/kong_arcade_for_sale.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/41709967399.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/arbitration_and_conciliation_amendment_bill_2020.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/tenuvofanonasile.pdfIn PDF document text
    • http://cabinetshq.xyz/lujafiwelegupufivuvixigebh4oa.pdfIn PDF document text
    • http://leafester.online/when_can_you_plant_tomatoes_in_south_floridajrr1g.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/Oigibgc/50665387271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_d7a73a7e7b1448ea82f5d061767658bb.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_3764a51a2a8a45e399d881ac172d8e5f.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_a8bc6141d637456b824bc5a8cfe10f98.pdf?index=trueIn PDF document text
    • http://merapenerabari.myartsonline.com/nizubepi.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_1bd7314815fc4673a1e864b8ec7c8a3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/fender_super_champ_x2.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/osrs_cooking_guide_without_gauntlets.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_96c4ed5d552b4f8b944b1e845c175c33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/lebegavedelogitipefukos.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_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 5184 bytes
SHA-256: 06d1ded2080bd064c1e3bd0c3e2859f37fdd99789fb6dc3525b296b86e03e085
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11072 bytes
SHA-256: c1cb246ecba101165c789452275c2c80d853705c9b26595d6f00d3843890477e

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