Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cac8c717cb9a6b…

MALICIOUS

PDF

87.2 KB Created: 2021-10-15 15:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 519b8c93ce957ae4eed6c4520fc80148 SHA-1: 264638346c3aa6021d7fb9e5248744c18d3d87b0 SHA-256: 37cac8c717cb9a6b5748d6a5ae8fc67477809bd5c240d4879aebe0ff2b6f16bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=past+life+regression+near+me PDF link annotation
    • https://mklaassen.nl/images/file/fokamovo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/nelogajemejuxizizafutul.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/pawomakix.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/dunebizukumononad.pdfIn PDF document text
    • http://accronline.com/userfiles/file/44140182757.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8c2e9bf1---61992663653.pdfIn PDF document text
    • http://eternaseguros.net/files/files/78137563120.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/wafenoxuj.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/17506095698.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/polipunopuzununurivabo.pdfIn PDF document text
    • http://climtech.com/files/files/9416974599.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16163075c71cbb---65591356276.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/72260026401.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/2886642386.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/4603034705.pdfIn PDF document text
    • http://cpils.com/userfiles/file/sodika.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/sepitazugenovowizora.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 10556 bytes
SHA-256: b33fec1ccd16576e15ef7688dc10f3cfb0e62f129175b8ccb04b39d1050c4043
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 19488 bytes
SHA-256: d78d34a9984a9f1ceae1c44524525d08b6500e8fa78b98a45fcd7875386c565e
font_02_sfnt_off000137f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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