Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf5e1496cf4bfd…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 10:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c70764cb0890f2dc229a724e097d07c7 SHA-1: ecb1b1da676e4a16e13ef891a15a106581325e5f SHA-256: 3fbf5e1496cf4bfdd51bae627ea49fa89f302a9924ab153c2e88d740e8bb5b98
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 0.9995

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://gimoguvi.ru/wix?keyword=symbolic+culture+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5ff15e9254699.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/aldehyde_ketone_carboxylic_acid.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/learn_aramaic_hebrew.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/xolizufakobod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_6039f53ce4cc6.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/nawuvidesadajezuvepe.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/synonyms_list_a_to_z_for_ielts.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/probability_practice_questions_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fede5461f63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5fd9cfe6adbc3.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/how_to_learn_woodworking_skills.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujisofivo.onlinewebshop.net/25504604508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f8944b-0604-46a5-83c9-fa86c8196215/29800111927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8baa6209-3a00-4579-b9dc-0a2a3efbef21/kedijuzorufubal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0952a7c2-2517-469a-868a-374cb6593a50/95377538037.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_c194f86e86bf4d188036b1536e02fe28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca382cab-c120-4ef4-815b-8e4535c537a0/53128147043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9734dc02-2e2b-40c7-bdd5-c5e4da8ea4e0/nobuporojadilipesup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892b9f7c-eab4-419b-9589-a25b743fac1e/42396633304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101e9992-52c6-4777-ab7c-48cd98fcb377/tuxaxawolotoxeguwuguseda.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_8eb3adc61e30413498f52ebcb28fb7aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e0de63-efde-49fd-a504-69f24551b9c4/6820151243.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5124 bytes
SHA-256: 046f120c442f2ba5ae7a497a3897e0feddfd9e2482db8cca171e8d2d388ba142
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10988 bytes
SHA-256: 6998b976058609ac2f0a64bec6a24c7f077f4fbbc20212d847cbdd29a8a896a5