Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d80ce9a3d8d38…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 08:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 855d3261a9beace43d040d8c92e7d14f SHA-1: 3f4690a00ad1b7f404322965700ea47058d2e017 SHA-256: 7a3d80ce9a3d8d389f3946967c60f748082f1120642b959fcc374bd21874b4be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or malware distribution lure. The PDF also functions as a link farm, with many distinct hosts and a high number of links per host, further supporting its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=windows+10+loader+by+daz PDF link annotation
    • http://jcbcharpentebois.com/ressource/site-image/files/mivix.pdfIn PDF document text
    • http://moneymaker-gold.de/files/9954244640.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/46986683021.pdfIn PDF document text
    • http://sentai.cc/data/file/20210906_210307_483.pdfIn PDF document text
    • http://eksternest.be/images/file/42529165851.pdfIn PDF document text
    • http://shamayachts.com/upload/file/vakex.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911224857_MzU3Njk4NDQxMzI=.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/nafekimagidenubogegafowol.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/97007409351.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/94989432680.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/29494709613.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/duzipubuzuromipugo.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/lirexavezezaxanofexin.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/43800775779.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/61790359266.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///netowaku.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/sijukutitejejosafi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kelenalazak.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tijiwenen.pdfIn PDF document text
    • http://hla.vn/upload/files/48684696230.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qr0imoti7lhp9fb6pfbo86pp59/7195006050.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/16493455809.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/46307589923.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/nikuwovupuzolurasu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/8839905797.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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 15832 bytes
SHA-256: 834e254252eb3c5b28c7cbf796ec7b066cc84a2350bca62f95e3517da4d998c5
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10712 bytes
SHA-256: 4ac5e260e4b407609fe7b8268bb31d17e0f995b03bf0df9b5f64c38f60ecbde4