Malicious PDF — malware analysis report

Static analysis result for SHA-256 14504b15836b9a9d…

MALICIOUS

PDF

73.7 KB Created: 2021-10-05 15:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aef4c01e9e95186207a55872f8260cfc SHA-1: 7647ac343640c434373ea1dfc538efdeb995483d SHA-256: 14504b15836b9a9dffe9198250cc0ad42322c98b16d5b5a25d579778e92aa9be
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, suggests a phishing or credential harvesting attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=does+ipad+support+pdf+files PDF link annotation
    • https://tekstilkentrehber.com/upload/ckfinder/files/98157903478.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/juvozetoduranisotetepute.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/80362123749.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/menadoful.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610a6c5147---31447751265.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/muromeraxesixezulan.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091004362269.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/80926740488.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c02f49658a---fujufuvamemujudefetodat.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/gosunivapasemi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/78011114133.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/zaxifolo.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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 17408 bytes
SHA-256: 1a958b86da736255572d9af228074eab567624799b3f0ef5826e8dbdf7ef2a87
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10488 bytes
SHA-256: b506fe80c9b0360a45d90d42db72a9a6ab8c91e020a950eb70cad00d1c8400a9
font_02_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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