Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ed3520a9e109dd…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 15:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aae250be4e6f95317bb18a53fd6b4fe0 SHA-1: 53a99c12fcf474147061c70e1868e31e23e72c42 SHA-256: 03ed3520a9e109ddcbf83517647e997a2ae621a264b4a48c5ff41f605b00ee25
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/wix?keyword=ak+bullet+guide+rivet PDF link annotation
    • http://jizawilezi.22web.org/mijos.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/minecraft_education_edition_chromebookdtnuh.pdfIn PDF document text
    • https://rebadezoj.weebly.com/uploads/1/3/6/0/136027304/1827aaef7.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/bBNiilj/digital_advertising_agencies_in_dallas.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/favop.pdfIn PDF document text
    • http://itslm.fun/39378084511dotxx.pdfIn PDF document text
    • http://finovadi.iblogger.org/37508375000.pdfIn PDF document text
    • https://cdn.sqhk.co/nojenite/mhfC1h8/gomewojuvovutepoxixezoraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulomalizekuvu.rf.gd/evaluating_primary_and_secondary_sources_worksheet.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_77f77b2fb985497d8f9c4b7b647ad836.pdf?index=trueIn PDF document text
    • http://parezorizujax.rf.gd/80536046586.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_8cdb3c5cbe334a028d30ede4b0e270b9.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_161df80dee0943a8bdff4aac0057861e.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_87ee06580da441ecadd726cd918540b0.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_e77e981741ce4d70a60bdfbf79f730fa.pdf?index=trueIn PDF document text
    • http://mujozitovisiwud.rf.gd/chehra_kya_dekhte_ho_lyrics.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_fc600d0062294033a6b343e463fadf22.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_49c4c7079d144233830b09ff32471f49.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_d2e24d0e7ff8459797ce103383255d58.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_a8632fc98f1845478139228e3fa1871d.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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 4856 bytes
SHA-256: 5bd17f1084c789f40c561f0c974e38e6291bf39b64a79527d5b49fcddc758138
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 11216 bytes
SHA-256: 71abf71fe31d2ea441eb426de2e3842a357231526b00e4158b5f2ab5d0c47aed

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