Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c306d36162a0cf4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 17:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a129f3219bd96a95714ae5810cdbf3c SHA-1: 1cb174e1413398ead5fe9d384bd9259bd1726a03 SHA-256: 4c306d36162a0cf462b631df8bf263a1699629476e38573c163c93a1c9eaf00b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a lure for a password-protected archive. The embedded URLs, though many are benign, point to a pattern of hosting potentially malicious files. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the archive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • 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 http://obchodsezlatem.cz/upload/files/xejuwefenukajoruzeviwubeb.pdf In PDF document text
    • http://bulmarconsult.com/files/fabipogumixojasojivibunej.pdfIn PDF document text
    • http://teledirk.com/d/files/dikekulavimoruvenirejop.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210914192849_52003423.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/62871247882.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/radedudukozijobot.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/77868683942.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/74798794657.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210914171445.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/witut.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/70090586285.pdfIn PDF document text
    • http://toroisg.com/public/images/files/27528754098.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p7u6s598h2j3psf6i8au6rs57/guredijagugaret.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/28114031726.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/63348391112.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fe26312010ed5b1d74ad3307b1091064/gixirori.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/gelas.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210902060441.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/midibiwafatose.pdfIn PDF document text
    • https://unosms.us/userfiles/file/24758197266.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/10823637821.pdfIn PDF document text
    • https://tsegypt.com/file/8321787177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wwe+2k20+apk+download+ppssppPDF link annotation
    • 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16904 bytes
SHA-256: 08c1536f5ffedcd32f30d023d5e6cecc408281870cad3efb2788908a70711434
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10508 bytes
SHA-256: e711c9693fabb90f49774df5b06b8c898e9086e8af2cfdec8a3d1b2e65830085

Open this report in the interactive analyzer, or submit your own file for analysis.