Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a025c37f08e73b…

MALICIOUS

PDF

80.5 KB Created: 2021-05-16 06:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c049cfa2f11be0371e3fb3d93ad4a4b SHA-1: abc7a172981dde4e31c7ed36f06576b29e5680bf SHA-256: 00a025c37f08e73bf7906a12ba342ab31b3214ac9afd533b5194bce4c94a2ad4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external links, including a primary link to 'midufefew.ru' which is presented as a search result for math problems, likely a lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to redirect users to malicious content or a phishing 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://midufefew.ru/wb?keyword=1st%20grade%20math%20problems%20with%20answers
    • http://tebapewulodafe.getenjoyment.net/65542554256.pdf
    • https://cdn.sqhk.co/tajiwikiter/iiheji4/wingstop_delivery_postmates.pdf
    • https://cdn.sqhk.co/tikikizeveni/ggYjaIN/origami_instructions_star_wars.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_b6f7048d38d5465383f1af57f8d944ab.pdf?index=true
    • http://piwakitidi.onlinewebshop.net/libro_temperamentos_transformados.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_dec64af333ce4ce9a9ff5d575847edbe.pdf?index=true
    • https://s3.amazonaws.com/legipalofi/how_do_you_pair_ihip_wireless_earbuds.pdf
    • http://fojiguxojed.epizy.com/balance_sheet_and_income_statement_sample.pdf
    • http://lojubefogugiku.onlinewebshop.net/biochemistry_textbook_by_satyanarayana.pdf
    • http://vajonaz.epizy.com/best_push_pull_legs_workout_reddit.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_248a143016c249f48e70354f248228ae.pdf?index=true
    • https://s3.amazonaws.com/pirofopafu/81986233544.pdf
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_f165c0b67a2f4a52bd975fc5ecc99e1d.pdf?index=true
    • https://s3.amazonaws.com/sugosubexez/40_shipping_container_home_plans.pdf
    • http://jojanotesejivi.epizy.com/puzozewujojugujugubam.pdf
    • https://s3.amazonaws.com/salosibejodod/minecraft_server_1._7_10.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_0ad269a339384a3ca3cb361a696e7519.pdf?index=true
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_35e9c2c5dfbf4821ada6e29de6f18f5c.pdf?index=true
    • http://borinalujid.epizy.com/xaruxoxagadugiku.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_e293675d7bb8406d989fafca8a52d87d.pdf?index=true
    • http://namupurifu.epizy.com/sopoxirimozivabarutibozat.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_off0000fa96.bin
3a9f54e3391ba9658b4c42ab2cca715bac37bda803833ff72b5fe4ccec2b4faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 5560 bytes
font_01_sfnt_off00010d64.bin
c43063682816ae127d747fe765810875f1ca994ed0259239c5f550bae4777ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 11348 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.