Malicious PDF — malware analysis report

Static analysis result for SHA-256 1719dbd7691c050c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 13:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 045289229d5fdbcc3e61ce41db3f2242 SHA-1: 398f8fd78b94ae942f11836440eb87c3cc18f1e6 SHA-256: 1719dbd7691c050cc01b69b14aaae6cae8e09e7ce9901172c99c3a88bc331db8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'garglob.ru' and another to 'boldino-hotel.com', suggesting an attempt to redirect users to malicious sites. The PDF structure and the presence of embedded URIs indicate it functions as a link farm, likely to distribute further malware or conduct phishing attacks.

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://garglob.ru/uplcv?utm_term=descargar+emulador+psx+para+android+apk PDF link annotation
    • http://boldino-hotel.com/ckfinder/userfiles/files/bomebitivuw.pdfIn PDF document text
    • http://unibox.lv/files/text/gijemewepezuzeduzadi.pdfIn PDF document text
    • http://pnalog.ru/images/file/romed.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd25f7b9782bdf2831a2860635812b1d/23830781320.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fuliwexagixoler.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/dowumefes.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/16941422603.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/48178938461.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/dakagigewadameradeder.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/siwufidijuvawuken.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/ruvezorutobesozigokaxuru.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630542482.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/deboxagumozufepasipasofi.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/66214907614.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/75814534213.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/51287587188.pdfIn PDF document text
    • http://klenderbio.com/upload/files/xenefefij.pdfIn PDF document text
    • http://actinq.nl/upload/file/bepaxenuwujonapijev.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xinipirodepexaxegu.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/sedorarefano.pdfIn PDF document text
    • http://agrion.org/upload/fichier/garavufukuradabegatupuv.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210915file///rafirikenasexe.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kelawifo.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72786107563.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 11052 bytes
SHA-256: e24af7867f883db48f439477b2dbd6cd36b36aeb8a490d1709cc60c57808802a
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 19016 bytes
SHA-256: 3576ef8df666dc92ffadd9724cff102b5204b52ec05145229a497e28bd970f86
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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