Malicious PDF — malware analysis report

Static analysis result for SHA-256 897a384b9005e7a0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 12:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ec583cc3e8ca01148377e1ae6850ddc SHA-1: a4dca4a49f3e04d03a15287f67aa83a7ab033fa0 SHA-256: 897a384b9005e7a023a2d41d779c6a66d72f52844c14d0c60588f58b7b1b87a6
174 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_DOWNLOAD_BUTTON' indicates a social engineering attempt to trick the user into downloading a payload, likely disguised as an archive requiring a password. The document's structure and embedded links suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=best+private+browsing+app+for+android PDF link annotation
    • http://mijinmotor.com/fckeditor/userfiles/file/wawafugewapus.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/bibonef.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74190281481.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pevoxujofuweribefunopex.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/33349451533.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/18109133729.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/faxebewujarameje.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/wagikedurevobawivogawunu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/29829844723.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/desowurez.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zijoxepuk.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/45843834077.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/48465092091.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/pujopezerotimebakuwazu.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/22860941046.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/retusasopiruke.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/gesonodetirejasogodiwu.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/finikefosefaru.pdfIn PDF document text
    • http://poiskvod.ru/images/file/53192295775.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/wovolemo.pdfIn PDF document text
    • https://motoralbini.it/files/file/dasadis.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/38891114987.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/mimevokitenufademunigun.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/84212434924.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/boxevi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/08d0db3ce5b29eb70b4557283c23162a/41900928068.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_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 10972 bytes
SHA-256: f0242b3d45e303de2d14873054bbdb0443f998487ba89985b4768d307263fe82
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 17052 bytes
SHA-256: 589121cd4bf69d8ddb5a2c6a7b2614d889a27b92389db4ae0a6766bd3d4d37f0