Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e78481f534247…

MALICIOUS

PDF

79.8 KB Created: 2021-04-07 21:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e7f565a21b4d12b70716b16328d2c79 SHA-1: e57bdcad882121a652a915d5a9c1daa6571125f4 SHA-256: 767e78481f534247af7936420a2321c90f029ab61d6eb6a2b5a19e1098b8bf6c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to drive traffic to external sites, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=who+does+lara+jean+end+up+with+in+the+3rd+book PDF link annotation
    • http://nakanilo.club/952082106606s3h6.pdfIn PDF document text
    • http://popularchoice.space/crystal_report_runtime_13._0._25lumwp.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/44378945348.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/converter_to_word_freeware_download.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/49106074293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475720/normal_600147c2b3f6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424683/normal_5ff6a76195d11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_6212a56776d340ae8d13f5aaf87d3983.pdf?index=trueIn PDF document text
    • http://liraperuwuw.atwebpages.com/how_to_improve_lyrical_dance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eca496e-de0b-4d25-a440-265aa896a5b8/what_is_the_greek_root_word_for_stone.pdfIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_aa4092fa34414c9497608a727588bd54.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_c166ddac4f0147389326c601e15d7be9.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_782bc765d40f4f0596c5641df3721385.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_4f94a31e79ce490dbaa0f14c69f9a0b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/497e9af9-a599-460e-aecf-49a0765c0aed/revetufagu.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_53f610bd4ca24257848079d83958fc34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8d05e8-fe4b-4537-a9de-b0a0b64f81d1/ap_biology_lab_4_plant_pigments_and_photosynthesis_answers.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_bcbf4ce11e074bd5a88249ca267d0acf.pdf?index=trueIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_aac98cce06014a07ab9f2e7c9ceb7786.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4216ab6-d2e5-45a9-b496-bf44b37f65df/41969492200.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_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 5596 bytes
SHA-256: b1f613cdcfc9896e21a47ae86aa3a8cc6c7ca597b8c3313cdf002db44cf51a61
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 11700 bytes
SHA-256: b069eeb95bd147c0f3f4279b92ae8afd360f9e3c2dfd4b5cdaf9c3657e198062