Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f8c49c4c6e3d09…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 10:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01552cb696347d12e2f4ea4c540ec71f SHA-1: e29b6dd4cd55efe8b81b4c8644dd1838e42b6206 SHA-256: b6f8c49c4c6e3d098cf8c4340588b5de8e2c0874a1411fff2741bba4ff21cf6d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Access Token

The PDF document impersonates a cloud service, such as Microsoft 365, to lure users into clicking on embedded links. The heuristic 'SE_CLOUD_DOC_LURE' and the presence of numerous URLs pointing to potentially malicious PDF files indicate a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://chcial.ru/uplcv?utm_term=sign+in+to+office+365+account PDF link annotation
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/bigodibogededitu.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/rawixorifadut.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/5230323142.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27661111094.pdfIn PDF document text
    • http://hanleyresources.com/images/bofupewojigojinimu.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wubosonuvoforokunofo.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/vidumunugejulawatomag.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/samaniwolagaxudujag.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zavumabubiri.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b9c6bd461507db866275b1d29adcfddc/fajidovanabatut.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0335c9a7a---xebewitibuduzajegub.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/77965744751.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/75374167020.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/81379513479.pdfIn PDF document text
    • http://kco.su/userfiles/file/fogenisutaxivutab.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/banajabajowasotefez.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/vuwomunet.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kapejilodi.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/woweno.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/19021591403.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/kozilasibimapudabimilori.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/33804898358.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_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 10848 bytes
SHA-256: 734b1b6991da00936deb6eaa887b1dcd642efb6414cbf445bc1ef00c757c3153
font_02_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 15204 bytes
SHA-256: 66beeb3e2a0e7facbed7077996f7461c3cdd53af2ffb173e2b62b0216a03f8bd

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