Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d3bfaa7d2e71f9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 14:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bbd910482d32e8f9bfa4a6af4119ba2 SHA-1: aa998a19a755b782fd577be657f3cf574852fc7c SHA-256: 51d3bfaa7d2e71f9ae044ee1e8bb4dafa3336fa75667479ac92dfe53c47a11f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially harmful content, disguised as software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=minecraft+mobile+download+2020 PDF link annotation
    • http://sung1.com/upload/files/10499417738.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/sazisegax.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bofuzinolip.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/49320730741.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/63758145240.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/vigitikugarodip.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/97560926713.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dunasexapatelidos.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/gizozovikawiviketelaga.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/79103848198.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/28710039339.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219191317282854.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/rugapen.pdfIn PDF document text
    • https://hobbypet.cz/files/file/jaxepogativezakewudokufo.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jenixemerefanebipewomatip.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/bubelonifu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2f0f4603267720a0c1f9fd1f87027ce0/fejapedobinaxepoxomodizi.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/mopumojutetareweverelubis.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/donap.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2511abc176a8dce3abbb67395e57694f/rujogowezalejaxe.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/62552618846.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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 10928 bytes
SHA-256: a2e677171621af4a186bc364c080a12463ec9c746d2a9ed98291f6e8287f834a
font_01_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 15864 bytes
SHA-256: 351e108035e1b3d1d89e7fe4db0f88386b65111b3f25280e416fbc507a5a829e
font_02_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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