Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf4dd8e6d23b364…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 21:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3d5da08405f83b4300bc6ec98dfeda51 SHA-1: 327e4d8099c4bf79cefc176b7e893096de6906b2 SHA-256: 0bf4dd8e6d23b364824b76dd52d1821ba0a749153039d26eaf7c03b2d4ec0e92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which appear to be part of a link farm or lead to other PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host multiple links on disposable hosting. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=i+hate+you+read+online PDF link annotation
    • https://www.rapn.ru/ckfinder/userfiles/files/fizotire.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090116374629.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/wufisameretudiv.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nulawedojosunepezurox.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gagun.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/gurasekonizamonuv.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/tesukuninidosipigewiname.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/11319213603.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/bowagokub.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/44045789358.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zamugenunefaroxokajuwod.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-22-46-16-92.pdfIn PDF document text
    • http://planetamama.ru/files/file/62423413160.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/23999986232.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/4498689182.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_105850.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32095078951.pdfIn PDF document text
    • https://webaprint.be/img/file/rosodizu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/nodubapalotepejidib.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/52432351558.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/pitujiwexurewomadu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bezewosuje.pdfIn PDF document text
    • 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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10340 bytes
SHA-256: 4f5b7b1a3c921a67593128c3f52c95dd1c3a3e4f50eac042c733f1a89aae277f
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 18084 bytes
SHA-256: ee6da96012420d333b89a868b706b6bb4c2e2b2640c349fa85fc5763ff6e5f71

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