Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38f5d95814cf042…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 14:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d9e29054ce3db276e61bd8441f3a5e9 SHA-1: e7463b11ea6a223ca72f03fe48295ef5a74ff8aa SHA-256: f38f5d95814cf04238f062cd21dca6f7a4cf57be510974e9a7a60dca4737d5dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=gta+sa+android+obb PDF link annotation
    • http://slmj8.com/data/userfiles/files/jutiruvajogozopumininigi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4010726067.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/romazubugeliwukajedodabir.pdfIn PDF document text
    • https://sanagustin.cl/files/kedupidunenupipapivegowi.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210922_234307.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/nilepomegagarawaw.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/35080912542.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tawazun.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/jabodupupapewiv.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jufen.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/74633095717.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/befikuligigozifeferidevi.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/girusobenobu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5fd499fb0a8d58e8818d4e0011298f12/taladimexuwedewabowitam.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/32670201505.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/34148242274.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/49512963010.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/1312418585.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gisevunitalifuwivaf.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/rizekesolebatobivosef.pdfIn PDF document text
    • http://chinazzjx.com/d/files/77286585943.pdfIn PDF document text
    • https://lasanisports.com/files/kuwedoxob.pdfIn PDF document text
    • http://lactopad.com/uploads/files/76936315609.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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 14780 bytes
SHA-256: 704689392cc2eee64e6203f967f503eb5f6f2d9faff1dca1e3f2c29b43fad434
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10244 bytes
SHA-256: 6b8a1a23e76658573f11ce58d98d911a53f0c3fea39a8c9a4b30488e6b8116e8

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