Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e98b194e45e75cc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 09:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98a2ed879350bc8e04f1a244ec25cd24 SHA-1: 151b225bcff2112e49fe73867b6fd6ceb76c220a SHA-256: 9e98b194e45e75cca659a9e89ad7a28f68c91660b99ab72f12fce8c358a31a08
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, forming a link farm. One heuristic specifically identified it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a likely attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://arucax.am/user_images/file/18763732032.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/61235422961.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/13226198243.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/4956402533.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/71013907589.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/27835321245.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132819decd38---75615978658.pdfIn PDF document text
    • http://innotack.com/userfiles/files/72009946141.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/69527914725.pdfIn PDF document text
    • https://granitnet.hu/editor_up/64174365167.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vonuzun.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/22170484009.pdfIn PDF document text
    • https://mar3ol.com/Files/files/gimaxoridowoxure.pdfIn PDF document text
    • https://zzhqhi.com/d/files/10416104853.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/ronuvulerurali.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/46888507155.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/vuzasilibatomevozire.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/68801127725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=publish+android+app+in+google+play+storePDF 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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 11024 bytes
SHA-256: 6135c2ca4408fec37ee2a09a498e6b0c2020972682e25d9c6048afd45bfac96a
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 17676 bytes
SHA-256: 71efd6b3f93c8a986e96143bf94e3ff8b165b90eb9a3cead5130480a62411ba6
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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