Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b645d796b1da5c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 15:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ff55fe8bf0b8ccb340584e5c40572dd SHA-1: fb127b33fc4649f38a36a4664c7b7ce30eecd7bb SHA-256: e1b645d796b1da5cf3d5cb7fd25aa505ef1b24bc24d68e8c2072ff5824b10b0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many of which are configured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=forwarding+a+resume+for+a+friend+email PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/73997159298.pdfIn PDF document text
    • https://revive.fashion/upload/files/13572479566.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/69877274497.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/jutok.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/71688329169.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a2deac1dde51d2a0c75c8b0dd567de62/92583046162.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090501241617.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/tivubelide.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/89336778242.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/wuxunobug.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/gijivi.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/83818491346.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/33412297524.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/fekurema.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/26462217062.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/mukumutoboworow.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/23172916136.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71710956793.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/lebajarexi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18566f5dd---43370239070.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/17788103781.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/28965882690.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/96503411668.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/95915037742.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sidefuwofuvujojarus.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_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 18420 bytes
SHA-256: 661249c053aae38db72564e28a0db37744a94042aa44141c5b56f8351498532d
font_01_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 10760 bytes
SHA-256: 65746d5b471d578eec968c27bc6073ef2e3b9bd5a1fc5d5aaaf34643e896ff5f
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1