Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb36cb58c9d1c3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 21:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72dbdf21ff87b6840d94f103061c55f5 SHA-1: 33043462c75579cf7dca301e5cf613206a2e031c SHA-256: 8acb36cb58c9d1c35450d67e0ff0b54f20b2acfc93f93b133d0258351cc1ea27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=android+os+screenshots PDF link annotation
    • http://ristoranteyuri2.com/userfiles/file/33588013632.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/juruwununetidadinivi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/venegotomavalidez.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/gozirabobakafirivikemine.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/34983618353.pdfIn PDF document text
    • http://dalaichau.com/files/60092257957.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf9554a6a---31875002652.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/76578133638.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/50304901384.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/303540984.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/46567493610.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/viwuluxobodupikorawiros.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/saroxofinogelafekir.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144ae49997b5---soselojututiw.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/resifurukoduno.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/kazadazejizodaw.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/xevativenalaz.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nalidovaxukujabet.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/15755700447.pdfIn PDF document text
    • https://basisangka.com/contents/files/lomubupapelakolezir.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/pinejozuxod.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/33813567794.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/jokivuvexamuz.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/35938558364.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 17840 bytes
SHA-256: 8efcf905017464214d5996f8bb951a3aa2072c4c57b06484df0df37cc5db6bd8
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 10240 bytes
SHA-256: 3ec95a587154828151302842a3d2600e4bbd640f72073a713e34bb4f28c4ac88

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