Malicious PDF — malware analysis report

Static analysis result for SHA-256 4125f4382c0166bf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 01:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cb5ace08d22f2123348b2324e348435 SHA-1: 93919f0201a3a903b83bd44f9da94663c45690a1 SHA-256: 4125f4382c0166bfba89101cf93b405a705d87e1797fc749860189a54c71c1db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or redirection scheme. The PDF structure and embedded URIs suggest an attempt to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=11th+cs+book PDF link annotation
    • https://durimawar.com/contents/files/tifuwasesuka.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/ritug.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/66184903572.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210906_927A5EF91BCBED9A.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/5300870944.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://kdsonline.org/userfiles/file/67608556367.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/22512789006.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/51097222525.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/modena.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/24300628774.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88534502635.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136e323d63fe---dajulixizijufatidasarogu.pdfIn PDF document text
    • http://regmac.net/userfiles/files/fozidopevukesevarisof.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/71210170597.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210910050859.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/wavuzemabafudoloranatito.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/xokigusomemexijipuzudiza.pdfIn PDF document text
    • http://status.cz/UserFiles/File/49846119093.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zuvovokexofixuwafixipuduf.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/vamipaloboreb.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/71739170134.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/69656703135.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/felipawudejibuzowaz.pdfIn PDF document text
    • http://capableapp.com/uploads/files/xojevivali.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_off0000ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 9880 bytes
SHA-256: d07d014999702c825ab5326d31fbba37f747e1a64a5550e7ac3e4401f77e8909
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16860 bytes
SHA-256: 510e439cad4009d7827a632e3cb8eae3b9c9ae6601e1e0889a7cc180e92f718e

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