Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c5fcc5a802a15…

MALICIOUS

PDF

80.1 KB Created: 2021-03-26 05:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b03364d01e1f524400baa189f140e0f9 SHA-1: b27ac312c010613319f363f629ae6ab5d47ead03 SHA-256: 4b8c5fcc5a802a15b039bd795169deee9da40b495610c10eeb851125a8c7f223
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://maypoin.ru/aws?utm_term=washington+dc+hotels+with+indoor+pool PDF link annotation
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/vujidaguwipufir.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/nervio_facial_ramas.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/ijiilgc/5975548778.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/ddabb849a.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/modo_de_produccin_de_la_comunidad_primitiva.pdfIn PDF document text
    • https://fatuwotivefog.weebly.com/uploads/1/3/0/9/130969768/witowimidobi.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/WjaCvib/kizojudoboxameneber.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/abdul_kalam_agni_siragugal_book_in_tamil_download.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/aptitude_questions_and_answers_for_freshers.pdfIn PDF document text
    • http://winclean-shop.space/58637992686efaci.pdfIn PDF document text
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/576814.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/zitapavubakobonekivu.pdfIn PDF document text
    • http://copyrights-notices-helps.com/47638470107iahjt.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/dogusonemiwugefexu.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/chhnqhf/payment_commitment_letter_template.pdfIn PDF document text
    • http://salebox.shop/62637745461axqve.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/af0282d1-d76d-4124-8453-2f71ba31bf0d/john_deere_4045_engine_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93c242f-678b-423f-b811-7bd3c325ba3f/investment_science_2nd_edition.pdfIn PDF document text
    • http://bobixupeto.myartsonline.com/jasitub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec299d60-8034-488f-8cb8-4431221fbd8a/percy_jackson_movie_characters_sea_of_monsters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f3495d-25ea-42c4-adf1-54ace7e7136d/bodas_de_5_aos_de_casados_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d6eb45-6101-4b45-9917-c2e12a59dcf1/92977561432.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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 5440 bytes
SHA-256: 8fc9c2ddd1345ccfffed84a195ea7489e321ac3e2b6601e70c08107b1b4252c2
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 11164 bytes
SHA-256: eebe823cb6a8d924b3c9c85c0c3eb0ecb39d0d25a43e0a73a586c32846a6bcac