Malicious PDF — malware analysis report

Static analysis result for SHA-256 851483eb9f80f3a9…

MALICIOUS

PDF

77.1 KB Created: 2021-05-11 00:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0b8d9a137fd7501e805895fe08cc2c11 SHA-1: dd235efb46381b0bc67dfa8ec5397febbc3f9033 SHA-256: 851483eb9f80f3a9e2127d47b2dd7413d91394598fbde34d7c5e48caa5c406b7
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to game reviews, likely a lure to disguise the malicious intent.

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://nipisod.ru/strik?utm_term=the+raven+remastered+ps4+review PDF link annotation
    • http://pet-guru.shop/zapisu85chk.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/weber_genesis_e-330_burner_replacement.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/7731574807.pdfIn PDF document text
    • http://jalosus.mygamesonline.org/a_view_from_the_bridge_york_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/iaiabge/42429582857.pdfIn PDF document text
    • http://getplafond.xyz/general_psychology_books_for_collegebwvx4.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/8537641382.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/animals_and_their_young_ones.pdfIn PDF document text
    • http://zabavnyi-slon.ru/727838520427a9m6.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/1JibhfP/20174652131.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/anglo_saxon_rune_poem.pdfIn PDF document text
    • http://itabody.space/direct_and_indirect_characterization_worksheet_answers4k6y0.pdfIn PDF document text
    • http://gmetry.online/chick_fil_a_grilled_chicken_club_protein_style16s9s.pdfIn PDF document text
    • http://mylic.ru/zidelxxqzr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_9a92fb37517b4d88ad9702a568550962.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_d007ed59a8ce49f3a2d911c1580bafac.pdf?index=trueIn PDF document text
    • http://noratev.myartsonline.com/11395180787.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_134e3f83239c4d07b1ac16307ae11dab.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_2388e4dd12ce43afb769922c5cf5bacc.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_ea300feb71164bcaa7beb85f569e94e0.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 5356 bytes
SHA-256: a9d7aa7f09a579ebc19f0ef38afbd049514327b7559742f0b00eb33686c8fc9c
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 11108 bytes
SHA-256: f0f165580cb60fad5e637dfba2b0e198b1a9203534e313709d60725bd09f44ab

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