Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3c7bf81a985d97…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 10:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 49f14ab6e43488913369c08da49cf9f1 SHA-1: 8574877ca071968767e14b333fdbc018002e2cb6 SHA-256: 3e3c7bf81a985d9756f4e15cb80602668ddaa81e7b0b4fdaf5f646e44aa9bc9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mariapolis.es/ckfinder/userfiles/files/29307232194.pdf In PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/jolubusirawafikutegisof.pdfIn PDF document text
    • http://megalaserasia.com/upload///gomebivasatisopagipitix.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/piguxejowes.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/19849396021.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72125725064.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164542efa9---selasedu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/babasafadudurisipojaditex.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tejufavoxumanofenudizun.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/81606700717.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/81606973284.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/67854429253.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/seganeko.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/rakarira.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/lizitabot.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zalivovaris.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
    • http://apicn.net/upload/files/muwutewuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f521cc43d---nemogubobulawavugimasubof.pdfIn PDF document text
    • https://cakkue.com/contents/files/biboxafagamud.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vakiwakaloterusojapit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chess+game+rules+in+malayalam+pdfPDF 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_off0000adae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 10972 bytes
SHA-256: aa4b1f2c6f238a66205651f9af5f9e8c2c51dad6d1ff1a06e0560ff4046a3fcb
font_02_sfnt_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 14832 bytes
SHA-256: 024d784e6f2d3f50788f0fbcf591a40fbdfb4d6b8f38d087d28a436178b22b6e

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