Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4998178a91dbce6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5211770f3289c172175f981dd4460164 SHA-1: cc4afadf411b5a995bbcda91fff887cb3846b939 SHA-256: b4998178a91dbce6aad72d5afca75fa407f360c7d488c1d349b42486beb72d71
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. The embedded URLs point to various unknown domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://perkunasstudio.com/uploads/files/202109091702525759.pdf In PDF document text
    • https://adminico.nl/userfiles/file/62475935789.pdfIn PDF document text
    • https://iwistw.com/upload/files/fepexeso.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040346307411.pdfIn PDF document text
    • http://www.heksan.com.pl/file/93886998619.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/99881459722.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/32005678887.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/mapugovapadefuva.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/95437245790.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zuvekori.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wikofinoresawefumimozi.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/fudukusibotokebav.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/61781002348.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/65729866514.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/jajologa.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/gapabudejodiwipefufab.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e85570e8---74635207964.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/8567651972.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/47852859063.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/rapixadizo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e189bf19---30233600641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instalar+android+en+memoria+usbPDF 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_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 17628 bytes
SHA-256: 357c60149f3557f1c68bf01639ad6ebb8ff120932e85ae25df8495b49e68b4e6
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10600 bytes
SHA-256: 90e3fd1e9c3d3af91356d9d5cdedaf13d4890bb53648730ad99f948e92f1d350

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