Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d16c9c061348c6c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 20:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 31fcdfd9e47baaec640ec8063a6969bd SHA-1: e92e353b55062d83c75216995aac8839c774dfac SHA-256: 5d16c9c061348c6c2d8a7559cff5100338c9dc83a552ecfd4cdc914c3528676a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://remobudostol.pl/pliki/66239282498.pdf In PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3ka94kh3hfjso1fdl25t6q84ar/watuwexepupoliposoza.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/subuvuwanusegifaxoze.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/kanigo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/7228106705.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210911_34EC5ABC0CB23081.pdfIn PDF document text
    • https://ptogel2.com/contents/files/59662311973.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/14263783743.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/waxinowewa.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/93072744356.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tubefovakarerimom.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lojiwanokawixosozuvijeso.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908055922.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/12423393289.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/30332189566.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/80990644692.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zabuvotuputibepojejer.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/varekivazeze.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/39979535574.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jisatupudidekobaju.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/sabuj.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/dazijabujukiberovofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sword+and+sandals+2+skill+point+guidePDF 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_off0000b838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB838 16048 bytes
SHA-256: 30d95f8a13812c188a1afdaf1d59f9dcddcb939b1528a67c61f38d98e3c6af38
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 11040 bytes
SHA-256: 83f26af19899b93966854b417ee98ae21d04e83515209494e24dc35bafdfe375
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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