Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f731277070cd19…

MALICIOUS

PDF

82.4 KB Created: 2021-05-12 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b7121f7c7b6997daafb07380a0a9e4b SHA-1: 28c90c70f5004d6ca7a10817443a5f03651c98f6 SHA-256: 10f731277070cd191d085e16e696e7aa75c0c826f5fb2337fcc431bf7927da58
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as lures to phishing sites or to download further malicious content.

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://jacksth.ru/strik?utm_term=bersa+380+ammo PDF link annotation
    • https://cdn.sqhk.co/peluxisomex/jjdjghb/76056833420.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/1599680.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/iRHpNJM/car_racing_gear_bag.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/hdjccMB/80079559824.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/3310906.pdfIn PDF document text
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/7806784.pdfIn PDF document text
    • http://womenita.fun/how_to_open_a_pressure_cooker_lid_stuck1dsfi.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/ea49bdfadf.pdfIn PDF document text
    • http://tublitalia.fun/24338100437uo8f5.pdfIn PDF document text
    • https://vixeweno.weebly.com/uploads/1/3/6/0/136049701/c0c287033df8fd.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/fhfXmTF/68433884248.pdfIn PDF document text
    • http://studyweb.site/parent_plus_loan_origination_fee_calculator73ulq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_4a39d1730b7e4822aee687b1154049c5.pdf?index=trueIn PDF document text
    • http://jogatitow.epizy.com/verigatekuteluwarod.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/51950454117.pdfIn PDF document text
    • http://modezimuriji.rf.gd/4608351701.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_6c8516458b6342ec89019c679941c7bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/the_colour_of_magic_movie_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/2209178913.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_7e6b7e9cecf24236854a3bbbf4f5ebdc.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_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 5348 bytes
SHA-256: b222e06724f25deb78ed562da659c2143625ccf2e621d4e764ba70a122f9e4ad
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 11972 bytes
SHA-256: 8180d4ebe0e64c022d6f337192bd721bc87c34f34976857d3bf32615bd87ecd6

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