Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc14cb06e5e0fb0…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 08:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 49aba51104a226849dd2fba5ded5b022 SHA-1: b9ef5938008d506937f7d83ccf30a79bae2d46d1 SHA-256: cdc14cb06e5e0fb089d7bb702c8396b0bb0f65dca69e54ad3b62f831695efaac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://abpaluso.com/upload/file/ruvesu.pdf In PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/2756758666.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/jagemubosalo.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/wavarunifujasejob.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nuburolorobenele.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/13967310470.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/45644550484.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tegafabifuboruputatawap.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/virasumoxegugiroronen.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/419256479.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/93581713214.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/baterimotowalolawomuv.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gisapaxum.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210911122440.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zizuvuxe.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/93585441266.pdfIn PDF document text
    • http://24cvety.ru/upload/files/lumusu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/nuzufozonoradiwal.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/36717155370.pdfIn PDF document text
    • http://boldogelet.hu/media/369600783.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/lumufeladuguvuduzovixovaf.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/gakubin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=final+nights+4+android+apkPDF 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_off0000acbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D4 10684 bytes
SHA-256: 4d10c6ca199e885a51276ce376cf3eb97e654d21adb9ff601051a7eefb012b1a
font_02_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 17220 bytes
SHA-256: efef4c149e36c5d7ebb50588fe34ec421a963333a2d5574a579fab5a30b07717

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