Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13ce7f66054331a…

MALICIOUS

PDF

92.5 KB Created: 2021-09-16 07:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c77a282eafbbb64d2842dbf77176aef SHA-1: 6d43a32e820efab15aad62ec62e902cce30dee94 SHA-256: f13ce7f66054331a9d5c24444145564103737a1dc6741f2d48030f4cf4cd8a29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or content distribution strategy. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catwalkdogcome.com/editor_upload_image/file/debifiwoguk.pdf In PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/86644462165.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/42592447421.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/25094243594.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/fomobibibaxofokefirik.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/mefexaropadijesesu.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zekatatuminibevegirevawez.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8a21e78f---wilakitubirax.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ridodenewigorife.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/wejefoxixag.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58742996165.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/38547385483.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/nisimefiwamujesepofo.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/87134673181.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/degakumezedaporanafove.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/lebebajogorerex.pdfIn PDF document text
    • http://contelex.it/userfiles/files/dolomiwewupexitagopaxi.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/35862210759.pdfIn PDF document text
    • http://classtool.info/upload/files/dozaviwupe.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tapuzab.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/15211029703.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/afda445e8b9756243eb6f56be44f5a00/34654985359.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/6398580638.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/duzamawoduderenilab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=after+2019+full+movie+linkPDF 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_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10744 bytes
SHA-256: d50f8be30968e02cbb5ba27447f359ea10c2204aef33159188a96930a077afde
font_02_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 17496 bytes
SHA-256: 1a7db66773baf904779db79a925a0212b4f0624bca149114f68f55c5bcdcbea1