Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b491575e06ce0f…

MALICIOUS

PDF

83.5 KB Created: 2021-02-20 00:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a3c4e33346fc5454ccb008f1a8078441 SHA-1: e82838a7cc2fff445a27fa9b3ba0df2dbf46789d SHA-256: 51b491575e06ce0fc304ffef5fcd87a96940263db0be1aa53d6e42b061641b66
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The presence of multiple disposable hosting links and UTM parameters suggests a potential phishing or SEO manipulation scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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://crophysi.ru/strik?utm_term=what+is+the+meaning+of+standard+operating+procedure PDF link annotation
    • https://cdn.sqhk.co/javejako/dhhAghK/browser_video_downloader_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/9hcjggb/junomelurotesevotevodutu.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/MiEPIih/homeschool_schedule_template_5th_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc7c3d939b3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fc6d62f3d4ee.pdfIn PDF document text
    • http://geosen.net/bazeligositosiki3dc48.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/XbicidW/7764322389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_600adf4915fbe.pdfIn PDF document text
    • http://bestsalestoday.xyz/platelets_formed_in_red_bone_marrowr7y7i.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/juzenamo_pokinukek_wiximi.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/5839992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_601df892e64b4.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/5100049.pdfIn PDF document text
    • http://gouliwer.online/xuromonedomewe1rwe5.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/QNghxjh/golden_boot_premier_league_odds.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/tefafesubezezu-buxidajewave.pdfIn PDF document text
    • https://dejamemetegabov.weebly.com/uploads/1/3/1/8/131856029/4447734.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/lMgfigL/pelij.pdfIn PDF document text
    • https://zupeloniz.weebly.com/uploads/1/3/4/0/134018773/tagajazipakeloreg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 5552 bytes
SHA-256: f9473a1102607851a6cbe5584812568ec491145b1e81264f05d86326339e5e47
font_01_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10648 bytes
SHA-256: fc626516a53205b513bf7a495a86aa775e0c72ae5ec15374240594385788a268

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