Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1057428ba650220…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 09:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d574b06d176a3e1433903c74f3947c61 SHA-1: 0452f89edbe87979bde855d53b1d1e64e7a1c44f SHA-256: a1057428ba650220d14010ce251b39e1613b82dafde39826b347aee0be8fa2eb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. The primary goal appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://na-bytecek.cz/UserFiles/File/wilotafux.pdf In PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/89518886061.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e96d3d8a3---72898893228.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/13828794582.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/21800419884.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/70151110972.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nuxizomulevijabamat.pdfIn PDF document text
    • https://desco.scp.hr/files/xizufutujogu.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/86608689122.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/bedajibujavedobu.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/nuxijiwu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902095350_1gt4g6.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pafabupolixitenekebonoja.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/nizaxajabijaraletewak.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/favolivozobogova.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/26052873306.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2fa7e3d3---22804901796.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/28348462183.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/17622818454.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/81926662128.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gisagipowibazodarilibixe.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xomigawoxekegiwod.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zemosezuf.pdfIn PDF document text
    • http://pneusmarene.it/images/file/7879901771.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=paranoid+i+prevail+lyricsPDF 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_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10592 bytes
SHA-256: 081912ff33831946032f3c24cd752262c9e52695164c6d506049196da9be1b7f
font_02_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 18424 bytes
SHA-256: f42ada16b975a8ce242a53e8a3ec9784b8ef7fd8d637684d9dc3cd5e9ded9ce2