Malicious PDF — malware analysis report

Static analysis result for SHA-256 89af21f2fe98a565…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 09:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3af41691b49e517267d68f471df7c132 SHA-1: 5d2291b0997edc9961dd5601976b884d18aa086a SHA-256: 89af21f2fe98a565b62fcd68358ddc9a9cf11410405096556332f4391b70034e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.findvoters.com/userfiles/file/83451918637.pdf In PDF document text
    • http://vkp.ru/upload/global/file/98751016664.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lesoxudodejetijarowabatok.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xatatif.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/27439592841.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15960421163.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/36646883402.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/69596049195.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/febuj.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140707161346.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/27064185197.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/sugimonowowerisiromedewer.pdfIn PDF document text
    • http://holzbau-napetschnig.at/80693202234.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dipofesigezijebududivuva.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/251102bc04d06a6f5aac8bad4f58134c/xitunezotugobonuze.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/42457347938.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffb27f8bc---81783472323.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/555345710.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/87916738495.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/73614020555.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/kapiwi.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/15454654245.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/97003974478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+fix+random+pc+crashesPDF 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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 11016 bytes
SHA-256: cfd2494edd646f4f6740d1d5ca35b74391db243f9ae7609aa1cf1844ae179e92
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 18248 bytes
SHA-256: 8f0749a17f374555c2917cf21cf55e9d0208d91f3939b76e053da1a4666c85ab