Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5018eb08bc4de29…

MALICIOUS

PDF

81.5 KB Created: 2021-05-18 03:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 78795c97b00abbc58f0b8b6781dcb867 SHA-1: 4122d7dfcfa52635b0233a2e9b83f58dc0404773 SHA-256: f5018eb08bc4de299333c5ad1329b3066cad2659a2908c23639e4193c31ee897
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=toefl+writing+samples+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5feb094776820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_5fe0ddbc36c11.pdfIn PDF document text
    • http://pejagepelif.iblogger.org/30887880851.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/4ea92cd262d747.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/298551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fcf039a6c0c7.pdfIn PDF document text
    • http://jaxopofo.22web.org/zewofevivefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_60672f2d9903b.pdfIn PDF document text
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/tugubub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_600491506c9c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5ff75d7216826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fef1621e03fe.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/6295276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_60201c6f47574.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/2223050.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/366178fa-c775-4d16-8526-e6c8db0da6db/50268942755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0404f8a7-8f36-4225-a55c-eb5e2973569f/baromefixunezamimigotep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b6c8b9-565b-4ca8-85ad-6b90f856dcf6/air_force_1_white_black_tick_womens.pdfIn PDF document text
    • http://xomedejufe.rf.gd/snuggle_dryer_sheets_sds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2479ed25-0a27-460d-8f9d-8929de557ae8/2472628794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e189f5-e2be-41de-9070-9f3377afadaa/is_cissp_bootcamp_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c2ce50-d386-4007-8501-fc2d4dde4dd8/93890623063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504cbc0f-9b04-49ae-9f3c-ed596206e35a/how_do_you_program_an_xfinity_remote_to_a_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d5db11-abc2-41ba-b7d8-52180e799f40/ukulele_chords_and_strumming_pattern.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 5496 bytes
SHA-256: 45aed625105a1a13ce3e54c49a57d70bde6a0b286e583546afc24a456fcf0304
font_01_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 10840 bytes
SHA-256: 7ebe833e6dfee5753a8048019ab89c95ac58ad748456549c0db841416fe2f208