Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b2f28797432f90…

MALICIOUS

PDF

78.1 KB Created: 2021-02-15 04:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d257dac1fad54e14a3443ce1b5b327ee SHA-1: e954a0cd296d2a0798efbc7a526f79db6e49b7f4 SHA-256: 25b2f28797432f908e163a50ecc839e7734ba72e14860dfe334d2e8d49817dd6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=slopes+of+parallel+and+perpendicular+lines+geometry+worksheet PDF link annotation
    • https://cdn.sqhk.co/wemowubire/hcjjaQh/29497918725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_600ade757a3a0.pdfIn PDF document text
    • http://vittorguxx.site/ronudeliburefopiso5xltb.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/request_day_off_email_template.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/bd4717a982fc0.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/MS6heiq/zarapajojajimif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fde6b3383355.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/galava_kajixedikid_xebaraxalulexi.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/jcPG3he/4320493353.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/bxidSii/xijufokuk.pdfIn PDF document text
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/pafurajurefewoloxinu.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/rmCihQZ/tiroxulupeb.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/4062610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamagirizotaro.rf.gd/75640329599.pdfIn PDF document text
    • http://tafekeremo.epizy.com/tigoboxedipomoropom.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://scripts.sil.org/OFLIn 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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 5932 bytes
SHA-256: 564e45140ab811ff646b9374c57dff63e6f980c1e0d7713c8947f6438b7e450a
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10852 bytes
SHA-256: 305cedb1cde1c727f4edfeddcfa530471a63ee01ea9cf11b0806586c76d85bf3
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16180 bytes
SHA-256: 49b8edc5e1099a75b270a5f97978cd6c51531e095c51bd484bc14223b105d77c

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