Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd00e04c8608786c…

MALICIOUS

PDF

85.5 KB Created: 2021-10-04 15:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2831c8b8c00571bd97e03200e583a650 SHA-1: 0ac8d475c5bb6971c45c76b64cca878ae17f4e7f SHA-256: bd00e04c8608786c13453253a2e133d0cf11caf18c9cbd62bd6217b4faa2632e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users. ClamAV detection and ML classification further support the malicious verdict. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://archism.ru/uplcv?utm_term=definition+of+stress+and+strain+in+mechanical+engineering PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/xamugawagiguvarabawe.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/29417273289.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/95591950872.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/2467936434.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/gugevosoxiredovusegij.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/fefisoxazaw.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/80353820057.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/judogibo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nanivomibokapipiwuwefasos.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/febowovibefosulef.pdfIn PDF document text
    • http://recviem.ru/img/upload/75068241.pdfIn PDF document text
    • http://fohow77.ru/upload/file/15015758446.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/1700601492.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/66690500143.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/muxuwetosez.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/fopaxanike.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/gewemigolivure.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/patadurabuzif.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/belolodaterilikar.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/turetoroxudajemitufaz.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/wedusajagizit.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xeribawiriz.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/xusepizetoj.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/88548209339.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/dunuvesabugamap.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 10924 bytes
SHA-256: 97f6a773cbbbcb2582c8a5ea2e4a4f3b25dcd35e0a8c7a6eaecbf4beec04c486
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 20880 bytes
SHA-256: fa31742ebcb68bf349d7389f7d32627ce0193f526d96ec9348573fb04861fad5

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