Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6d743128cd85fa…

MALICIOUS

PDF

69.2 KB Created: 2021-03-20 22:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b13e47ed2a585a363bc715e7261fb4c SHA-1: 4c7a503394bc566c42c934c959304180bcadcd0c SHA-256: 3b6d743128cd85fad7927f6378500c616d71952eeec45d83476a074370d027d7
186 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 a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The primary URL observed, https://kuzutuzo.ru/award?keyword=alconox+msds+pdf, is presented in a way that mimics a search result for technical documents, likely to deceive users into clicking through to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/award?keyword=alconox+msds+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505837/normal_603d3666882ff.pdfIn PDF document text
    • http://begdas.fun/wewadepudurufezagovalwfb9y.pdfIn PDF document text
    • http://pressit.fun/flysky_fs-gt3c_modpom7n.pdfIn PDF document text
    • http://eurozone.pro/917376470913bxx1.pdfIn PDF document text
    • http://timurberg.ru/suwijigu5wely.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/3093930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5ffcc683244ab.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/random_address_generator_us9ddqj.pdfIn PDF document text
    • http://grenkasalo4.xyz/what_are_the_15_republics_that_made_up_the_soviet_unionlpyqh.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/nasememusijabal.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/2672490.pdfIn PDF document text
    • http://drenajkrasnodar.ru/milosenatoscpkz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd2faee4de6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_6047489585fd4.pdfIn PDF document text
    • http://lbaranaydin.com/burning_red_spots_on_legs6tmwj.pdfIn PDF document text
    • http://prizinsta.online/evenflo_chase_select_harnessed_booster_car_seatfp8co.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_6011ebbebc601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_6874a8300d054561894ecf743b57c8cd.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_6e9bc417145941718d2c014b03a6ab41.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_69ef780213c64765be99f4b41d89c44d.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_01830ead57d74dd78d4eaf5876279296.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_d66aae7d994d406498fd5ca4cdfd8bd1.pdf?index=trueIn PDF document text
    • https://d9e21584-559d-470c-b0e9-829a80f361fa.filesusr.com/ugd/989f82_5aee65a41ceb4765806b1af3a3056b17.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_bc2b901e4a1543f0a312cfc1c4adbddc.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_84dd35592a664aee8773710c50dc9355.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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 5052 bytes
SHA-256: df83aff09b0f5a6a0d113b67f96c0770be05433bf4fbcfd615c3c816f2bf2d1b
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 9896 bytes
SHA-256: 884be02757a5a1b2a8abb316288b341521ae16353e2a9f9004062e9d3d63b27a

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