Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6151e73be62b7b…

MALICIOUS

PDF

73.2 KB Created: 2021-06-06 03:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f66922c1f6be353b7759f57fc3fa0b3e SHA-1: d6adc9e39dfd73a633dc910752d94722d40c6e05 SHA-256: 8d6151e73be62b7be32c8f3a32bff71f64f92ff19bf7f4d08e9827a9f5263642
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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://irlanc.ru/pbw?utm_term=certified+ethical+hacker+study+guide PDF link annotation
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/gurunojilajonovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fe61e4fc50ed.pdfIn PDF document text
    • https://jadusozig.weebly.com/uploads/1/3/5/3/135327359/vikerolunopas_vusebom.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/tebeno.pdfIn PDF document text
    • https://nanukofufo.weebly.com/uploads/1/3/7/5/137516761/jinoje_palajemo_temekakerumugo_rowimamir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601a7d79d6bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453329/normal_5fc8120a51050.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/b74a48.pdfIn PDF document text
    • https://kumexaper.weebly.com/uploads/1/3/4/8/134882622/2758881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144657120/nalowabijatosedolemol.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/art_as_technique_by_viktor_shklovsky_notes.pdfIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/144674661/what_are_the_best_pub_quiz_questions.pdfIn PDF document text
    • http://zetewufor.pbworks.com/f/gunal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0980f9f6-2813-4f77-a8e8-da9e445dec90/feral_tiefling_monk.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144604527/what_can_i_eat_on_the_10_day_advocare_cleanse.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144525672/como_construir_un_asador_de_carne_de_ladrillo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd10b7c-02e1-4d9c-ac05-3c267517c989/let_us_make_man_in_our_image_trinity.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5356 bytes
SHA-256: 81eaa440b9ad833489da91e5c223afca2c2953e6da13a51c168ee64c949860f8
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10576 bytes
SHA-256: c3089a6741e780e71c881e50ba6069ba770d487355145732adc8f1a5535f5a69

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