Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8ab87c11283470…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 19:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22501a537adbca8a19bc76d86371749e SHA-1: e3bef667ba9badbb6773541397f295f7dfc4dfc5 SHA-256: bb8ab87c112834700da16813c0f64b8f4a10159410a96609f8e6c5760686d524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV and ML classifiers. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing or malicious content delivery hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=stock+android+music+player+apk PDF link annotation
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/nesinajulibidunofulonure.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kejosurozatekiwoso.pdfIn PDF document text
    • http://rotang.net/userfiles/file/95566245924.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902133326.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/05fc11c5dd3ac819c4bfab409d782622/rumipedorumujoligazadujo.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/5172282557.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/2880984564.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/xetixinatojumenu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/14902516648.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/28300384706.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/88532674395.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/81637666245.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/14439882806.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/93189188279.pdfIn PDF document text
    • http://retailcop.ca/files/14762912158.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/besetoxozexavamimeniwaram.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/6344452590.pdfIn PDF document text
    • http://weingut-suppan.at/files/bipozobetofadonuf.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/47989405990.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vesaluzemonaluji.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wuxifepokunurakovokafiga.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/40355805281.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/renunekenoni.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13859676183.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/gezapajevibotosik.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 11056 bytes
SHA-256: cbf905b8b065e217444436ecee940bef8d75a10c89d858d64c0abc758351be73
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 17268 bytes
SHA-256: 9ef8494f76f2ef4e8bc90f415402ac6e7ed41e887e10b4f433a8e05834cb65f7