Malicious PDF — malware analysis report

Static analysis result for SHA-256 0923f1c109dc7d6b…

MALICIOUS

PDF

85.3 KB Created: 2021-04-17 23:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b34ebf3b3bd9b42782df7bfda92fae8f SHA-1: f7c03ee4263ef30116087e21365cc5aff8ce3695 SHA-256: 0923f1c109dc7d6be5697693a1a167838ca54574c255a6c3b085113cae366680
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to obscure the final malicious destination. The document body, though partially corrupted, suggests a lure related to a free English-Spanish dictionary, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=diccionario+ingles+espa%25C3%25B1ol+gratis+google PDF link annotation
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/fozekixan.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/maths_formulae_for_class_9th.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/1652674.pdfIn PDF document text
    • http://xobukafa.iblogger.org/sirixi.pdfIn PDF document text
    • http://lodiped.iblogger.org/bonamat.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/zupafufijuzi-kemebumab-dodiwe-latimomupewapu.pdfIn PDF document text
    • http://kalinakudukutim.22web.org/principles_of_teeth_arrangement.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/understanding_symbolic_logic_5th_edition_solutions.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/b192b75b.pdfIn PDF document text
    • https://fudonorovivur.weebly.com/uploads/1/3/4/6/134665028/605433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_098914fbdbac429c803ecb7649b95b57.pdf?index=trueIn PDF document text
    • http://jamurujitexezi.epizy.com/50287455746.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_4dfb86e88f7143da9410d79b19327ec4.pdf?index=trueIn PDF document text
    • http://sitafefisoju.atwebpages.com/51881258111.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_4db958f249c04940bae4da346b805bed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ea77f6-ea4c-4b03-92a6-2e7e36b009aa/lojakilolaguvimedirufugo.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_12911a2d2c704d15974f88d89ce4f31c.pdf?index=trueIn PDF document text
    • http://gikisomu.epizy.com/lipevakatoroluwowujotewe.pdfIn PDF document text
    • http://wizunanaxenuxi.rf.gd/angle_between_two_lines_worksheet.pdfIn PDF document text
    • http://lodexizizaki.rf.gd/dokuxujolenefimutirugud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e091a29-85f9-4397-b460-b5ccfbdcf031/how_to_seal_printable_vinyl.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/thermophysics_and_aeromechanics.pdfIn PDF document text
    • http://fuvudox.epizy.com/100_deadly_skills_combat_edition_hard_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833b34d1-769f-4b95-acb6-b5baeec23a60/tunupuxerogepaf.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/66161824387.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 5100 bytes
SHA-256: f5ed595b6fced351c4e38be03aa62f41ef38d39d47f231ed1165b9bb05abc33c
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 11920 bytes
SHA-256: 88bdac303d39685a03d90c2bec7e89ec8d0b6743cea81d55db678cf4b80735c9
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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