Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210afa6c70a7037…

MALICIOUS

PDF

88.1 KB Created: 2021-10-07 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cc51e3168ef6fe822650a58dfd7bca6d SHA-1: 3c450fc2193fe441e437df240eaaff705d8f87f6 SHA-256: b210afa6c70a70370d71fe849c669aab941664ec03850b322020a8fac51d283b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy to distribute malicious content through numerous small, distinct links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/5802072804.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/64539611363.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/84462052394.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/91480617300.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614188629ef58---17011135425.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/42391651920.pdfIn PDF document text
    • http://kes.org/upload/editor/files/3511361088.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/bagulinilumedama.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/xusili.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/pasikogezisigekonepa.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/pupakutudemages.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/sadegerenafobum.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/kibesotupi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/gunawajazu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146905177f98---gefibazupenopukelupuvipus.pdfIn PDF document text
    • https://chilepools.com/contents/files/60183190362.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/83837559725.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/95508977287.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wasetamexiloledaxedaso.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/75017417534.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/36837202012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=american+political+systemPDF 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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10632 bytes
SHA-256: 17aa0975175014ad0dc67767402a39444761a89da472071e7eb36d5662a5d639
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 19088 bytes
SHA-256: 5a39729ccbf72c8157f493e8424391b410f7cffda4f2ad72522ba5180f0166fe
font_02_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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