Malicious PDF — malware analysis report

Static analysis result for SHA-256 174b8aada2d92e3d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 15:29:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4558d7d2499dd39457aa7ddec9b9857d SHA-1: 90b69c918a642fe759915056e8c0039cb8a9f2bc SHA-256: 174b8aada2d92e3d74c57eecdf6cb73416ea13968925a5aa3c4dc0c344c90489
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=subject+verb+agreement+worksheets+for+grade+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370092/normal_60387284291b3.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/wegavanapumafenok.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Pcyhghh/jisutigunuloluzirepe.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/qhbhbih/thoracic_surgery_fellowship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391605/normal_5feb6b028da75.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/uF6uqjj/wamaxano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_6005c63257e09.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/LifKukk/6067828771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60471b586ee6e.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/2pnWjLw/word_for_a_master_plan.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/a0e832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f251112-8553-44c2-8819-0a96397747ab/80642877838.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_018b42ad92404551a39566afc3a56ad4.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_950fe8bf2ed344d685339c1e23013df1.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_37ee127f87cc4a1faefe30116cd63744.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2fe558-e16c-47db-a812-129793078e1e/51864615405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea4e300-4a66-449e-b42e-16dd2fe6c304/vegetarian_side_dishes_for_thanksgiving_dinner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3c7da6-9bcd-418a-a263-30274194b311/mcgraw_hill_wonders_3rd_grade_grammar.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_10b6a82375ff4eeab66c3a6022578e5e.pdf?index=trueIn 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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 6132 bytes
SHA-256: 7cb8c4ebff8db86f31497081ae303de8e7f8bfe63805a6f75284e42213479f81
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10880 bytes
SHA-256: eef4f0b1ede1bd6d559ec28e7d65b85ba54688059f38c660a586fd7bf4a743d8

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