Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bda3b51bf546e73…

MALICIOUS

PDF

95.4 KB Created: 2021-09-24 12:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a5efc16cf6e49dca0cf96e7349dee38 SHA-1: a192adbe56cbcbaaa0b01bbe61c1d28521d0b307 SHA-256: 1bda3b51bf546e734d3edf7c64b9d33967994463d3cafbda6e38971cf9435f53
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=the+hedge+knight+graphic+novel+pdf+download PDF link annotation
    • http://nhatrangpalace.net/app/webroot/upload/files/38070228994.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/77402858866.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tamiwuligewunarejonelobuk.pdfIn PDF document text
    • http://www.grifin.sk/files/tiveweramosolefa.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/62196153768.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/35281594971.pdfIn PDF document text
    • http://canoeing.by/pics/files/pewurekonivigurafogitu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/78135420374.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawirabig.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/43420012205.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wumomapowibixu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/91881912070.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/25508192677.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/dufipenolodefatugelub.pdfIn PDF document text
    • https://businesslife.com/content/files/rulimeluxovufixebapumobuw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4417ad9ea25556189e1a5650285360a9/96489576710.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/28672931573.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/roxusena.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/3602950278.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/65489823679.pdfIn PDF document text
    • http://caramelitos.sk/files/79663429496.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425e87748b9---54979664990.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/jutugabekavibesariboja.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/71284165580.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_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 10940 bytes
SHA-256: c5481719262fdcb3a2c0b3d7f8b1bb3d80fd584f5a62efa7300343ddc3d80ca0
font_02_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 17856 bytes
SHA-256: 82f766a8f20937db9822aa6466eb3c7cc57fcda530bb29d2857b5a5b3eda57f4