Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b21210b11a90483…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 05:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7336443c58214ffde536533eb236b5be SHA-1: fe7b9a1a5602360228f0f399c4b4c39fef02a246 SHA-256: 2b21210b11a90483130307c033180df2652370006f074cc2fd97c333fd7e24ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a link farm detection and a high-confidence ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the link farm heuristic imply an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://henca.com/files/details/file/89882437206.pdf In PDF document text
    • http://erimti.com/userfiles/file/nulas.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/luzidevijugizubixe.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/mutaj.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/49940676367.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/11060336581.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/71496441944.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6m7mde8m5av94d6rq3n44agplg/74598211934.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/74746708777.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/babimefatezetexeravulirat.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tepupitidunenufuka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317e26b19fd---xosubododu.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/50349810658.pdfIn PDF document text
    • https://ksuskalology.com/images/file/sizarajodaveka.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/20621743609.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/31616251217.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90895674848.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/47804920109.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/79434108993.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jonitu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110830.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/niguvubafasagokexuminata.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/16409907272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ridmik+keyboard+for+iphonePDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10840 bytes
SHA-256: 101a2e89c784027dde3257339587b6cace2924916e73509db095de72b03169f2
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 18076 bytes
SHA-256: 00e43f5988e69c8555e46122bce4ae6271e8829b7795a67bd746ac6120d7c244

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