Malicious PDF — malware analysis report

Static analysis result for SHA-256 2533a2dde5ee0586…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 00:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 491c7405b08b187617e2ef8efb54eb73 SHA-1: 73d6d073bd6ab79687833880e9a1bc4bb4108771 SHA-256: 2533a2dde5ee058634addcddcc9c5323c4798fd73810f9f1549cf87d7ba17b97
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded URLs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the document being part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to trick users into visiting compromised websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=april+2018+update+windows+10
    • http://parhelifrl.space/4145043927u7jcb.pdf
    • http://barajofa.mywebcommunity.org/how_do_i_change_the_pin_on_my_chamberlain_garage_door_keypad.pdf
    • http://frontglass.xyz/zeporurl0e1w.pdf
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/bd7767.pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_605d81b4f3642.pdf
    • http://fridgeservice.ru/internal_audit_manager_salary_londondapcs.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_605f80c21d185.pdf
    • http://medtechnika1.ru/82904043697gbpio.pdf
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/ad9ef53a42.pdf
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/0b05ebe5.pdf
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/4327999.pdf
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/3011039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://noratev.myartsonline.com/nejimopun.pdf
    • http://zodofujeki.atwebpages.com/kimuponamevinelosow.pdf
    • https://uploads.strikinglycdn.com/files/ea059012-0e7c-48fd-8ccb-4736ca01ae72/83159349393.pdf
    • http://nipanalex.epizy.com/nordictrack_commercial_x11i_reviews.pdf
    • http://vizawog.epizy.com/98852837866.pdf
    • http://kixarakukam.rf.gd/plan_entrenamiento_calistenia.pdf
    • https://uploads.strikinglycdn.com/files/d5d4f41c-ee75-460a-9d75-f9aa401cfb6e/67001945193.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_off0000e1a6.bin
73e382a4ef66355a1ea3efdb49ddb9ce292f378d55eeabf649bc403fde067a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 5552 bytes
font_01_sfnt_off0000f4ae.bin
0ba89efaf9051480cc24e3b6407d9f085cd0ed57e89d528fd2299f68e39d55b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 21076 bytes

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