Malicious PDF — malware analysis report

Static analysis result for SHA-256 896cb169b14d821c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 02:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a92399841b1feda08c66c6c6fa0d0d72 SHA-1: af1da5a6f52334b9c51c51e06347ca0a423d3b7a SHA-256: 896cb169b14d821cc3a401d9919a23cbe564fd540cb1ed9a08c24d1bb4845209
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://profil-metall.de/content/uploads/file/69422914367.pdf In PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/dopufape.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kawavonowilux.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/polokebesuguveginevafeta.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/gewotidujereburi.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/932503938.pdfIn PDF document text
    • http://sergeybazarov.ru/file/96385349033.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109221706045634.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/98869044695.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/tejasezuwifez.pdfIn PDF document text
    • https://istanajp2.com/contents/files/64714604128.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/volejuvovegijuni.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/61279118743.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/wegapiwunipifewesel.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/36680337867.pdfIn PDF document text
    • http://carbontuning.ru/file/sovize.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/86654742284.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/84340823054.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/nupekirofepolinifom.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/rorodumimexirosu.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/72573438883.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/50792363141.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a95d3c559ff8744d69f7292032f369c5/nozewonolebuzab.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59d37c2fd8711779b3299a0c8b1224b6/86540097130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ghajini+game+download+for+android+mobilePDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 17792 bytes
SHA-256: d31279e8a5ef4ec63f94997781243c1db27e877a170a1778e8b38bebe7de4594
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 10932 bytes
SHA-256: 6b89af3f48b93fc49c148110610cb272d7474070a78c782f23ad03a64c308ada
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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