Malicious PDF — malware analysis report

Static analysis result for SHA-256 853a0459e7e07e64…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 23:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e511fa5752fb9bedb2477ac5bad1a9f0 SHA-1: 6d70d8fe75cd989998a7700161373c4ac72b8925 SHA-256: 853a0459e7e07e64da8438400ec6d1f6e0dc65f45f69d5981967365c4835e737
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many of which point to PDF files with SEO-like slugs, suggesting a link farm or content manipulation tactic. The primary URL identified is https://lozipotod.ru/wix?keyword=organigrama+de+una+empresa+comercial, which likely serves as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://lozipotod.ru/wix?keyword=organigrama+de+una+empresa+comercial
    • https://cdn.sqhk.co/kasesiseb/Gijjejb/dirt_trackin_2_nintendo_switch_review.pdf
    • https://cdn.sqhk.co/boxewemutox/hcKhhib/the_chosen_season_2_episode_1.pdf
    • https://cdn.sqhk.co/rufonova/dL7agjz/73656624456.pdf
    • https://cdn.sqhk.co/mevazasid/403jgjb/recharge_online_sri_lanka.pdf
    • https://cdn.sqhk.co/gowomawabude/xjcggdT/xuvufagatirasu.pdf
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/basakotemunizobivan.pdf
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/1232152.pdf
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ffc953a0cae1.pdf
    • https://cdn.sqhk.co/sikozejaxed/cggtmid/effects_of_bullying.pdf
    • https://cdn.sqhk.co/vadezewe/ifhbgfU/pottery_barn_outlet.pdf
    • https://cdn.sqhk.co/sudidoxa/zjdigic/exiled_kingdoms_beginners_guide.pdf
    • https://cdn.sqhk.co/nepodowu/UGE7ifM/cruise_critic._com_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_6050ed3621b75.pdf
    • https://cdn.sqhk.co/zaletimerizo/cgeSbjj/junap.pdf
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/wenob_lidoxutos.pdf
    • https://cdn.sqhk.co/sugezigo/qNhdlNP/8d_surround_music_player_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4406454/normal_6049bdae7156b.pdf
    • https://cdn.sqhk.co/tulotunofuz/gchgdex/maze_runner_2_full_cast_and_crew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_b1ea5d22c00d40918a49292de5b8938d.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_a3d51f0e9762479ba2f995c41045ac29.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_b4f62d9552284f65b0d978755e785894.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_85446a5a87974fe196cef4e0357d9aeb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f297.bin
bfa9b3f9c74965b5845acb57e85e089c328c59ff1be7427d49160e5f53f083a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5420 bytes
font_01_sfnt_off000104e9.bin
df80fe602bd1415a18ca50fd66e4f34e2df822f070111e34b565e4c8f9ae643e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11280 bytes

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