Malicious PDF — malware analysis report

Static analysis result for SHA-256 313c7cea027839ae…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 10:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7676024b4c8fbebf46354ce894b3fcaf SHA-1: f450f528a112bbde9d04e6b4b51d2eb1d380759c SHA-256: 313c7cea027839ae8ebf682cc2ebe804eba387fb8149b815aa87e61b16641af9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The PDF's structure and embedded URLs point towards a spearphishing attachment attack pattern, likely aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=musicmatch+jukebox+android+app PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a391c0291e4f322239f64cd8037a8482/garigivekedavorukedi.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/30197064275.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/remufifudojifidexatamub.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/67015811701.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/puvozegafixerizunizo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/gasofedozalamowe.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zulalip.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/23663176896.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/famexojoforen.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/96105478029.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/fememuzukukofajebusotubon.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/75074099853.pdfIn PDF document text
    • https://thehouseproduction.net/file/nuripujuginajulolonaz.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/85852239253.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdc9b32a7---1813404946.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/95951328473.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/18424592003.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/33304464905.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/wufipewipux.pdfIn PDF document text
    • http://health-bridge.in/upload/file/44257783908.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/xerudewawagaxibexaxotas.pdfIn PDF document text
    • https://novitas.ro/files/biwuvagubevimivuvatebaz.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/22605616001.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/61233159170.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/joxewiseg.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/zotowuvijigawa.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 19552 bytes
SHA-256: 8e531dd3c4880671eae3a258c597925e820dc33087b33a84190b64600f8e3ecc
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 11288 bytes
SHA-256: 08bff9eddf7f08d8926768631fd47b7fc16f4d022f2edbe9b14e9e132a1e22c6

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