Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2147103513f31f7…

MALICIOUS

PDF

131.9 KB Created: 2021-10-21 00:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c462cc7d49daaf51d313e0a823670f48 SHA-1: 111cef899a04f28362919123223f13a96536d320 SHA-256: b2147103513f31f757d4b4ceab898130254dcd22264cf4bcc0c7078dddaee263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://tilestone-pools.com/i/File/8772723875.pdf In PDF document text
    • http://watchimport.eu/In PDF document text
    • http://jawarakreasi.com/file/94968854723.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/totewitu.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/korosujesax.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/ruterimaluj.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lorazimafupufezabo.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/bawosisefok.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/5133753330.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/konisurewilusozigok.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/zufitibeweleb.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rivejonugi.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/bokewizizenefutanunepet.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/45646630344.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/fekorelujofikikodawamego.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/34904123915.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/fifimolesole.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/melagamusarevo.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/razifituvufuxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=solutions+manual+design+and+analysis+of+experiments+douglas+montgomeryPDF link annotation
    • 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_off0001913d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1913D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A954 11232 bytes
SHA-256: 4e5acf0fd54a349e357b027ca181d5000a9bf817d557897130c1ac36815ff491
font_02_sfnt_off0001c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C36D 23684 bytes
SHA-256: a73ce7ade89392d95af214ca4f5fd32697ef24637340cb42c60e29ee9c715e94

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