Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c492bf79a883867…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 13:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de4da6006f714f88c64d68905fe40218 SHA-1: 9073ddf7c89bddac582c38b909e7f5b7abe30a9a SHA-256: 8c492bf79a8838672da9478562c94528d126a466492f310b5a1ba2f6de68e640
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure to click on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=main+bergen+county+line+price PDF link annotation
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/tupixigujaval-gavojagivivi-jivojuk.pdfIn PDF document text
    • http://slimerecipe.org/prolog_programming_for_artificial_intelligence_4th2pn1u.pdfIn PDF document text
    • http://gelchlen.fun/brother_ls_1217_partscnuh0.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/dusen-safazovom-kofipuwenuj-mipage.pdfIn PDF document text
    • http://medway24.com/el_dador_de_recuerdos_gratiswxmjz.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/ejercicios_de_nmeros_primos_y_compuestos.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/ddb8a.pdfIn PDF document text
    • http://nunagese.iblogger.org/counselling_skills_for_health_professionals_4th_edition.pdfIn PDF document text
    • http://betflixguvenilirmi.com/vijumagawavurdya3z.pdfIn PDF document text
    • https://paxowudozu.weebly.com/uploads/1/3/6/0/136095727/vezepagilimo.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/50291478462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_8ea9aa45972c48caaf70f324f0b678d9.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_518ec74070914467b0cd7f05d351e45c.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_322310cea81b4556836698431873e8b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizup/wiregorabitizitanix.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/basic_english_grammar_questions_and_answers.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_ab68089dd71846f19ba30335f4ce0d05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zakunafu/clasificacion_de_las_cuentas_por_cobrar.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_db5f2dd22bba4aa2bf86f704ea5ba412.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 5172 bytes
SHA-256: bb0b9b941ab46a5acdf42c13455ecdd0b0ca69287e2c2f07fd2e043cb5b1681e
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 11768 bytes
SHA-256: 586ab9f2bc8f42cd97a86b92602d862c927899150cb16bad3e30676b50fc454e

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