Malicious PDF — malware analysis report

Static analysis result for SHA-256 36689a909f18aec0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d050e25bd9846150c8ad35367a91223f SHA-1: a9fca8e74f3a6971be8536aa67f5e214e869145c SHA-256: 36689a909f18aec0de8985f700767a19239814c7e200478d34aa78a544848a56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('allytemp.ru') that appears to be part of a link farm designed to redirect users. The presence of these URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=redmi+note+8+pro+app PDF link annotation
    • http://metrocars.london/survey/userfiles/files/nolagi.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/pelalolikozulusekopakux.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/25082695635.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/60310309496.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/31726803307.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/jegodonejodod.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/zuwuluxa.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/ripunikofujusefafufikidur.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/xupowapeki.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/fenumokeruvu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/94666061573.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/jejawoxag.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xiwin.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/1302126557.pdfIn PDF document text
    • https://avenue102.com/uploads/file/gogadojagunivojore.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/bogobupuzet.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/jobogebusesag.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/jusifigupekibejiwo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/624be6b755ab8ff0fb8f28bc1aa64ac2/1484167039.pdfIn PDF document text
    • https://mashura.co/userfiles/files/lutusisokolibom.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/tirenepobesidojedusenetu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffee3951c---46253603707.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210916225347.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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 18064 bytes
SHA-256: d2369ccd7492ec137300ca96ae04805beaa74a22ea51ec6da3068afe4573af9d
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 10592 bytes
SHA-256: 27810bc1f386200cba302bda2871c9060264d5cbd9a04cb3ceb72aa79e77c559