Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e869ce2d7e6948…

MALICIOUS

PDF

80.0 KB Created: 2021-09-25 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d7fc522a1544af09f1630c69a05cc03 SHA-1: 9c951858a5205de53c111154ae7831d99e9ad657 SHA-256: b5e869ce2d7e6948f5a85a8f01a3f873402b97757629e88073fbecd26875067d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest it is used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=hp+android+murah+tapi+canggih PDF link annotation
    • http://trust-law-firm.com/userfiles/file/20210914081940_1151284210.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/furefunul.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/97178096145.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/pafim.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/68095955386.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/14134814091.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/14932395934.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/3151053867.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/butiwupasigegadu.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/dojaxikaz.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904213228.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fapokusanigalitufuz.pdfIn PDF document text
    • http://gibisch.org/files/files/38685712192.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/buwiv.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/7455013709.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/33486554469.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/7761101242.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/44015527401.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/78224031778.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bc960147---70013414384.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/larodomodopabasepalubon.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/liwuzubavoze.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/96116341722.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16100 bytes
SHA-256: 9f13951f0b557c357a3fdb032a8b7de59ff851f51ba007fe3f9752620a8e95b2
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10708 bytes
SHA-256: 51eb77159e4ef502af767ece85a73974df3143beac6d0dc52c6c83ce4f0e47b2
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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