Malicious PDF — malware analysis report

Static analysis result for SHA-256 79903ba3ce905a30…

MALICIOUS

PDF

74.2 KB Created: 2021-10-03 03:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 615d5ee4bd03c55afed1b24dc9b73d4e SHA-1: 5faeb994a0408f2970df4a9498eecab232713da9 SHA-256: 79903ba3ce905a30be6bcc66ea83143c27534a81615279669b299bdaa649c1cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=sharepoint+2010+tutorial+for+beginners PDF link annotation
    • http://lagunaapartman.hu/images/user/file/28538517142.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/20116565322.pdfIn PDF document text
    • http://lg-palette.com/upload/files/vufiwidabezar.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/45916548792.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/pujurevurufotape.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nirivirobefumikula.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/lowikomudaf.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/lufuto.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16152b2b28e4b7---81724851658.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912064443162297.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/manemuwufinuwi.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121424202396.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/76431294343.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/zilodod.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/zibepifaradipomef.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/sotewuxukegapukitijun.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/mikuvuwefeg.pdfIn PDF document text
    • https://theurbanthinktank.com/files/konuwozo.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/71288095246.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/keruwajugegesomowufodanu.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/60985300177.pdfIn PDF document text
    • http://sciattella.net/images/file/tepaxosutosuwobemu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/dovub.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/56927950213.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_off0000b95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 18228 bytes
SHA-256: 94a297fceb1c62d3219aad304cc305f58d0b0b209d2355ca5f26dd4670657cc7
font_02_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 11244 bytes
SHA-256: 36439fde0e8439412000c2e13be7c4f0320f10ab4307247298cd0e5928d3bfa6

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