Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dbe1dce09c072d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 14:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87de9ebd007fe57729a4d2a860184ded SHA-1: e55af19559e84d2221e45faa0f463615df0483b2 SHA-256: c1dbe1dce09c072d060aee2274801574c4b1f18fb4e7f0add6d83bf2ebb65a24
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://kuzutuzo.ru/wix?keyword=technicolor+c2000t+modem+user+manual PDF link annotation
    • http://borejukeluteva.mygamesonline.org/vifexunab.pdfIn PDF document text
    • http://wixoxamovoxese.22web.org/practicar_ingles_basico_online_gratis.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/fewigulebodo.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/vojitevogez_fosatefolesavux.pdfIn PDF document text
    • http://pifanaliriwabo.mygamesonline.org/sirazibekujonodap.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/tufafo.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/anarkali_malayalam_full_movie_free_cinemavilla.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/sophisticated_lady_ellington.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://s3.amazonaws.com/kelageketisefuv/education._com_valentine_worksheets.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_bc1c504bb308440c8cbe89671f8edfb0.pdf?index=trueIn PDF document text
    • http://kenuvebusuvi.rf.gd/ravewabutenidun.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_2d44c97c69b64b18afaf6d8f1db85397.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_40127cd3481042c2afca9970028b33f0.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_fee84b23194d4b699284676ce28c6490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/kidde_kn-copp-3_manual.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/questions_to_ask_hr_manager_before_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2a8e14-7c8c-4fde-89d5-54ad448d5a05/36706819973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b85514-4392-4166-8b84-8f9963856d4f/mcgraw-hill_my_math_grade_4_student_edition_volume_2.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 5284 bytes
SHA-256: 41869e0686b774e9bce23ba9c5fd6b47f17916728551d1e9cb12aed23c79f2fc
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10988 bytes
SHA-256: ad7d518bc6ba670f262d264af11cf8ed8ca8722035f4c188c49b7bd344f1fde8
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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