Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f40b68e8e0d4938…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 09:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10ac6201954b0f6d4805512b907eef2b SHA-1: a5aab4bf20e7a8a8f0e1c7c05d56da0239f46761 SHA-256: 8f40b68e8e0d4938e973a393f3a49e7e6ae9ca9abaff5c7653c6f28341ea9873
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many pointing to PDFs hosted on disposable domains, suggesting a link farm designed to distribute malware. The presence of 'utm_term=ios+setup+assistant+android' in one URL indicates a lure to trick users into downloading the malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=ios+setup+assistant+android PDF link annotation
    • http://fotocaroli.it/userfiles/files/99268769983.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/putabenobafizilaf.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/zelekufew.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jetokedikeve.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sewisani.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/38706778737.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908113525.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/kopel.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/pavugobamedejitilukuzapem.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mekepugifuroxetir.pdfIn PDF document text
    • https://computerzone.pk/file/zelodosapisovu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21f383134---gulisetob.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/budafet.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/60761396172.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/69237114309.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nodaralijulifil.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/54064626810.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/mijuturoxit.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vasugakezibono.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/67181652676.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/92386712669.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/8098969504.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/gunerukafazes.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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 10392 bytes
SHA-256: e7f70dc50c83d4c9dead7d0dc98bf51df4e0158ef3c3d8025c16c5d87ebf2b26
font_01_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 17500 bytes
SHA-256: 10b0ebcb053620ee5753b45459c6aebad4562b4e7e85126ad676d9c4c52f934c

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