Malicious PDF — malware analysis report

Static analysis result for SHA-256 67496c7572e829a7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 03:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff38a2974d92832b99ca6e33ead8c75 SHA-1: ef70775d051515202e5f8a49e865acd138b8a694 SHA-256: 67496c7572e829a7629788dfd9db0cc60552caeed7d04840c72ef90102a32e17
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=point-slope+form+worksheet
    • http://zisujetev.iblogger.org/flagyl_davis.pdf
    • http://manovina.mypressonline.com/the_maze_runner_full_movie_in_hindi_download_480p_filmyzilla.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_601edad8d8a45.pdf
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601b802ab679c.pdf
    • http://gewusoluxul.scienceontheweb.net/npt_vs_bsp_thread_chart.pdf
    • http://forovasax.medianewsonline.com/gixukizezagabo.pdf
    • http://zamividiwido.22web.org/bihar_daroga_previous_question_paper.pdf
    • http://buputenajonix.mywebcommunity.org/64869707527.pdf
    • http://nariwunuzaw.scienceontheweb.net/kababoz.pdf
    • http://tajuliwelofiti.medianewsonline.com/barazojulimipivugug.pdf
    • http://nesebonuvobeju.getenjoyment.net/does_humidifier_really_help_congestion.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5fda68ae51b4e.pdf
    • https://static.s123-cdn-static.com/uploads/4401559/normal_5fe24b717d841.pdf
    • https://static.s123-cdn-static.com/uploads/4415950/normal_60019b2d57181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suwetiwojiza.rf.gd/branches_of_philosophy_file.pdf
    • http://gosigugul.epizy.com/zovapet.pdf
    • http://desebavufix.rf.gd/chronological_bible_timeline.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_deb0bd3e086f45aa84d2b1c0d908ed54.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_ce95745fd7bd40069f3f388e862e7771.pdf?index=true
    • http://zotavoje.rf.gd/xda_developers_lg_g2_mini.pdf
    • http://vexabimumemig.atwebpages.com/what_perks_do_apple_employees_get.pdf
    • http://kagomovibinat.rf.gd/donidegoluf.pdf
    • http://winulinimax.rf.gd/90554985646.pdf
    • http://bupagiji.epizy.com/sefusitepegifisupesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf0.bin
95a00312a8864d38e04f63438fb9b42a3ed33f7914220908249418e62f879fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5120 bytes
font_01_sfnt_off0000fe4b.bin
e4e7aa9c32853ce8dc55eff423c13c9e530765c4078817b4831b7f9d840deb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10012 bytes

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