Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b1dbb2b996f6f6…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 10:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6d890d7f60026df4261aaa49d09e01a SHA-1: 5d50efdd1548f857a22f94782488bad18f2fcc81 SHA-256: e6b1dbb2b996f6f6a6781b9f19074251fa33305c13fba49bfa9576fbbbb481ff
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

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://jottigo.ru/wix?keyword=tekken+2+apk+obb PDF link annotation
    • http://kiruvoxexuk.iblogger.org/gazomujenomawepibedasuf.pdfIn PDF document text
    • http://ubsvp.com/exercice_triangle_rectangle_ce2ckp5p.pdfIn PDF document text
    • http://tur8osale.site/vifasopelawarerykyr7.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/6989614.pdfIn PDF document text
    • http://leadtop.co/moviesda_2009_tamil_movieon0hv.pdfIn PDF document text
    • http://malapiwo.66ghz.com/mapa_america_politico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5ff5e3f92ac16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fdc0df5b2d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fdf31390b0e0.pdfIn PDF document text
    • http://lozhobelir.space/51183453683nyr3u.pdfIn PDF document text
    • http://faceit.su/42181219523pjevs.pdfIn PDF document text
    • http://matteset-spon.space/juxuzojaxafifiredvv5jl.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/4287931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fdf062667868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forofadikov.rf.gd/math_riddles_with_answers_hard.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/define_platforms_in_programming.pdfIn PDF document text
    • http://xuxegukazo.rf.gd/clabsi_cdc_guidelines_2018.pdfIn PDF document text
    • http://piwunutid.epizy.com/vewadafukepowik.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/84411512012.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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 4792 bytes
SHA-256: 4823aa64755f24602a2a66cdb4176c222290c03c42a0c7f429a0552e75002ffb
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 10628 bytes
SHA-256: 43d9433187544bf7babb70abf9524fcf24ec1bcbc5c9897af5346de4c6849867

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