Malicious PDF — malware analysis report

Static analysis result for SHA-256 a070fcd7e6dae659…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 19:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b00ec5f920a31a8e20dca88758a1be28 SHA-1: 82d3d051c5019f2fdecf873e94db3790815318cf SHA-256: a070fcd7e6dae659fce301a4d83dbb0bc71c1d88d3ccf7281ce6bc49874c8322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, characteristic of a link farm used to obscure the ultimate destination or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nsaimmigration.com/userfiles/file/ralabejagatigodumof.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78754118031.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/16438887547.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/wezegitefapojokerokajosi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/69209588152.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/warusikosebebip.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/38610730129.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fekudiv.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/bagigumumanibuxi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/69179553430.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodetukatum.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/mapuviladarukolejigagoxoj.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/pidedo.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/miwewelonadupi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeefe1d340---53837667850.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/12025242011.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/36866172766.pdfIn PDF document text
    • http://ahknchem.com/upload/files/40974185607.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fulipodamigeruga.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wupagevebotugazoxazat.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/72513718145.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/6229708565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what%27s+the+app+store+called+on+androidPDF 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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10636 bytes
SHA-256: 72c3abbc85735a7b251788a10f029c36af0d6e0c478670e7348a8ac71483cf27
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 17608 bytes
SHA-256: 6dab3cc65cc173e254849484b8a690234e2cd1128c6f101a7cebab6c0f4f5ac6

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