Malicious PDF — malware analysis report

Static analysis result for SHA-256 968242a0883cde0d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 12:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b443750d61fd0940acc4b39fe8e51137 SHA-1: 80181da424186a0d133fef74e7648ac79d1db7f8 SHA-256: 968242a0883cde0d1ab97ba7ba47c0423da7eb80a89a14747c2b384f41f3c439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaktutzhit.by/uploads/files/3675282400.pdf In PDF document text
    • https://springkasteelhuren.be/userfiles/file/75102856954.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/42165111255.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/18006394281.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xebujodovuveluwoluzag.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909120124668153.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/bumujozunez.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202198444156038.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/76872016709.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/19045057900.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/lofezifarulifizimilatuga.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/roludalinatasu.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/47635379403.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/22286440027.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/letunovanajepizevur.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95845505434.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zexunakagabu.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/vutajuxugiramuforitefom.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/liwawerelolozija.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/61112775471.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/26010858679.pdfIn PDF document text
    • https://asi-filter.pl/files/file/jututatu.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/zoraf.pdfIn PDF document text
    • https://costarica4d.com/contents/files/73031642745.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/sufizebog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=disable+system+apps+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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10436 bytes
SHA-256: a2b9c0412e20a3d204b8cde0177156b74f89265b4fae729ce7809854e63d5589
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 18256 bytes
SHA-256: 0e8427dab47508567dfc1700586d9eff6bc253a78b466dca8424ba418f38b974

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