Malicious PDF — malware analysis report

Static analysis result for SHA-256 884f97b6f7f88122…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66aaeb5c28ecbfb1bb1ad0fbe336e2b4 SHA-1: b580293084fb1b365eb69a753353043c557463c2 SHA-256: 884f97b6f7f881229853c20573adc5e48b92b18630a4fd6e11128cba248f7737
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+permanently+delete+data+on+android+phone PDF link annotation
    • http://miyisz.com/mingyi/images/userfiles/file/57141048836.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/830375479.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/56107951675.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/26477733310.pdfIn PDF document text
    • http://rcot.by/pics/files/mewamapufekisusi.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67778361655.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/87967452519.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/32247437258.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67461295533.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/vuzerelinetolo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cicjnsdr95hnamg20lbp2rn0ho/deduzolaka.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/22377554490.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/kemusutakeluzav.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/149377847.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/najizitiwedinide.pdfIn PDF document text
    • https://mattress-leader.com/media/xosakevojiburezulajajan.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109191717098474.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/bokadukofalegaludufenab.pdfIn PDF document text
    • https://mcsfood.com/images/file/35505836855.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/risirebowuniwazexupolifig.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/70650199720.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/guteros.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64002285005.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/96977133049.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/subexurisapiluduzivujob.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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 17620 bytes
SHA-256: f986fa155fd2fa929becb17c8b840b430bbb1634a77196e76bec1e5cc7003e53
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 10680 bytes
SHA-256: 67b34914b48dc580206b64ecb7b60ca264f70cc0e0a00501921a742d000fba23