Malicious PDF — malware analysis report

Static analysis result for SHA-256 4412f5daf44a7a82…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 07:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f31ac02b7af2a5346dc22b16c7b265e9 SHA-1: 8fff15273cac79af3ec06e37bbe7cc0c5324ef7e SHA-256: 4412f5daf44a7a82960e84ebb77f3cfcf77666cbffe49b60af4e234de7390fb6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://esperanzadeavila.com/fotos/file/65553086163.pdf In PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/79280668788.pdfIn PDF document text
    • http://i-physiology.ru/upload/jenebepebesekogav.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/50430221000.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • http://z500.si/files/49578631495.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334334dc24a---pimusunan.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/lodosirul.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210907024519.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/posajozoridifozusiwa.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/pufepival.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_40E174DA6724761C.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/pubopunasugigi.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/rumatajikix.pdfIn PDF document text
    • http://vpsystem.com/files/fck/razorurewojabujaluladagux.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/44075797107.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/tolom.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wifagolinujujoputitinate.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/xuvubo.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/redofe.pdfIn PDF document text
    • http://domainecomps.com/documents/files/72220899172.pdfIn PDF document text
    • http://air-con.ru/upload/files/vereniremesu.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/95986179485.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614267a87eb76---57703648482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+mirror+my+phone+to+tvPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10396 bytes
SHA-256: 72c6cc899ad1d03fe641644f7c8ac933ce3313b416025e954edb91ba89aeaf36
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 18392 bytes
SHA-256: c16d239212a1a07d51317e85d623f473297a9a13ad1eaa10db6c71bbe812612e