Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c5301fa3d7c95a…

MALICIOUS

PDF

79.2 KB Created: 2021-04-17 11:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61d3eb22e672b50b74c862cab6169294 SHA-1: d20578dd4fee0874598f543ee6d6f30dea174523 SHA-256: 63c5301fa3d7c95a84e62494f2e001dca8260f66923682f6c6066565b6cf7bd5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, a common tactic for SEO manipulation or to host phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+is+pmd+in+business PDF link annotation
    • http://jakiduve.scienceontheweb.net/gastronomy_definition.pdfIn PDF document text
    • http://justamorem.com/17374733534hekgl.pdfIn PDF document text
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/kofopa.pdfIn PDF document text
    • https://nodigikoj.weebly.com/uploads/1/3/4/3/134384892/44e63904cd.pdfIn PDF document text
    • https://dazobexureza.weebly.com/uploads/1/3/1/3/131383777/gokekolukadugu.pdfIn PDF document text
    • http://metryck.info/how_long_to_play_curse_of_strahd8z64e.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/vokoleli_mikiz_difawavub.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/7a163383.pdfIn PDF document text
    • http://koreanluxe.com/634622480027zjey.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/leibel_and_phillips_textbook_of_radiation_oncology.pdfIn PDF document text
    • https://modovepa.weebly.com/uploads/1/3/4/4/134464072/xenizozebo.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/sejorasetezifiwibi.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/lizujelobirede_guterajolanunij_magidog_dozibofi.pdfIn PDF document text
    • http://quickpapp.online/falesevesekadatoragos4t1g3.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/6065465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_d276b455be4b4c3a9f2b9bb6b140648c.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_5bffa07742b04a20b048d6ec4eb449d0.pdf?index=trueIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_e41a6f52bd4a446b8edf0854ae4728d7.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_e2bf7dd17e4c46da8595e55c7455e2e5.pdf?index=trueIn PDF document text
    • http://nabenejajoko.myartsonline.com/senavakosawuridofolud.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_26554c29eaf443419a46f1543420612f.pdf?index=trueIn 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_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 5224 bytes
SHA-256: 262b0bb52d64e8a18bf708b1ff737d20ccbe7670a84c000a4d7201ba9c53293a
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10980 bytes
SHA-256: 2be0572db9e2d75af50ef8ebc56b1222e58002c3eb36cdd1e4c16122478622d8