Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4713bed0802328e…

MALICIOUS

PDF

73.9 KB Created: 2021-04-18 17:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f532192a3bbb77e542d56807e3f1ae SHA-1: 10eee735dd0a2b6ade9c405beccdb5e41fbcd1eb SHA-256: d4713bed0802328e10e6384edb67d10f8fb7157a6a07257da28d08859309d857
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://ponafet.ru/strik?utm_term=radio+shack+scanner+manual+20-404, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=radio+shack+scanner+manual+20-404
    • https://cdn.sqhk.co/xozirijor/fUstje0/mario_level_editor_online.pdf
    • http://bagidopivulo.mywebcommunity.org/youth_bible_study_lessons.pdf
    • https://cdn.sqhk.co/rorajakura/jcR2Ouu/xarerisubokutilu.pdf
    • http://suzaxikuzexaw.66ghz.com/26292953956.pdf
    • http://fejukoturig.medianewsonline.com/how_to_set_sony_icf-c1.pdf
    • http://vipadobotisituz.mygamesonline.org/what_are_the_different_types_of_literary_theories.pdf
    • https://cdn.sqhk.co/jabakujivim/5A2idig/80009204805.pdf
    • https://cdn.sqhk.co/xaxovowupofa/mjiUGI8/11974704655.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_58a688c976734ef4bb8b20928b2baba9.pdf?index=true
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_5649c55bb38c48cea68e4ad4a758fd89.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_ab471e83a4ae46af85963fc31eb886c4.pdf?index=true
    • http://nawabagaxux.epizy.com/guteg.pdf
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_ec8c6919717645e3999e508af6625dda.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_64e3301fda7f43668e3ecbf90e14099e.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_cd715ad47a8148c49bbfb8a183024251.pdf?index=true
    • http://lagamifex.epizy.com/jamolitilezikamafogajen.pdf
    • http://mijogivuxob.epizy.com/95280187804.pdf
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_a025c4e46f294e22adebda7908d53dcc.pdf?index=true
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_55081aac455745abba3d270525a84a8e.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdee.bin
648872330ff3cf6223dce11fa8043bb77de8c6a2e7cd076b0b7856caaf5a06d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 5644 bytes
font_01_sfnt_off0000e106.bin
20faed7df2d2b91490db937c1be063fc7af49085ca331b237d9644d0479b9094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10336 bytes
font_02_sfnt_off000104b4.bin
fd2e26fc2f803dcf07b0b58048f95075aa07ade0877caf7b60c502d13bd4189b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16196 bytes

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