Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845b2a082bb2039…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 21:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9e96728a06409cad2b13e564fcb778c SHA-1: dec3a2b700ba7a56cbc969dae67d02c622b326d9 SHA-256: 1845b2a082bb2039012eb13faba14cf5f13db090caf90d84a207ed7a7fb8dd80
186 Risk Score

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 0.9997

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://resalured.ru/strik?utm_term=how+long+do+kenmore+front+load+washers+last PDF link annotation
    • http://gelokan.sportsontheweb.net/57208462495.pdfIn PDF document text
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/137778.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/minority_scholarship_form_2020_20_download.pdfIn PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/mijuzuboniw.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/7a321f854b.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/2503574.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/6015075.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/2298934.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/88802408732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_47e7fb8b7cd44e33adfbdd78d8cc9de4.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_4728fd5fa1c74091b410ba6993aba7f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/cameron_dallas_she_bad.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_3cb993f05db9454497e256fa14579b8f.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_f50aa365a4ee4f82b10c20871ae0cca3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/abcd2_all_song_pagalworld._com.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_879ea2872eca48afbf95579f5170b0ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/sonanatituvigodinawo.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/rules_of_play_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/apa_ethical_guidelines_forensic_psychologists.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_b6174322ee9d4c7297b1f1982daff8d2.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_82b78cbc2c5c4ba59e30c55c059afd6a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5180 bytes
SHA-256: 07507034a66aaa82ba264072221f302a3b065fd69083fd4550f760e19d50c355
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 10520 bytes
SHA-256: 97cc3bc7ca8d5960da9bf878551479f713de10717d5fbd6dfcaf9efcb5401b90
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378