Malicious PDF — malware analysis report

Static analysis result for SHA-256 2763686a06b0c480…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 18:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d3072122f2f549fdd0283cca5f3092c4 SHA-1: 309f7468454814356f011619cdd557bda1d16a67 SHA-256: 2763686a06b0c4809815e8f11b51c1e25697edb42f5970e001e52ecd213aaa16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous disposable domains. The embedded URLs and the PDF's structure suggest it's designed to redirect users to phishing sites, likely for credential harvesting, masquerading as an Outlook sign-in page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chennothinterios.com/uploads/file/10374591422.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/kijozudisa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/17936417776.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b638096d7041c2946e145c37d2620d01/48906949852.pdfIn PDF document text
    • http://livestocktool.com/d/files/87536467129.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/2846070516.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_013108.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/45294942373.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210904151132_1932303723.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/mononusarokuvagu.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914170954_s3y5m5.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/37404645707.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/vajijikavepafofakub.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/35593069304.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95160877712.pdfIn PDF document text
    • http://mrybalko.ru/files/dojepunepigaxujubaxu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/65993494731.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/25747207793.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908140137-mazopuzukunowifazuri.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/83364796076.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/xamututul.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48546499910.pdfIn PDF document text
    • https://felicityokolo.com/file/61349807080.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/62355348787.pdfIn PDF document text
    • https://activepymes.com/pub/file/13951006140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=outlook+sign+in+officePDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 16528 bytes
SHA-256: 1087629bfe414c546055c6b6368e11b7fd9f00d6de8b210c055fbd8b0140613b
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 10464 bytes
SHA-256: b1e4fdd70b8da60bf24faeb7e8f9ba8bb62811b093b9a7fce04eeab1a953439a

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