Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4babca2f5ec0033…

MALICIOUS

PDF

74.5 KB Created: 2021-05-26 03:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2db78456dd4ff0a79f68cec6409eab1 SHA-1: f488c1d42e7905c772330fc732d77923f6e5443d SHA-256: e4babca2f5ec003376cfccdfc3563de82b8bb0671c4f3dc7e6fd137f603d18e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body text, though partially garbled, includes a title that appears to be a lure, and the presence of embedded URLs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=guion+de+pastorela+navide%25C3%25B1a+comica+corta PDF link annotation
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/busivajira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_60511d282eb8f.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/xinopamerosadopugo.pdfIn PDF document text
    • https://nesojusoxo.weebly.com/uploads/1/3/4/6/134631750/momoga-fumalolifav.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/tipowazised.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_60091373cd4b2.pdfIn PDF document text
    • https://muzikalojex.weebly.com/uploads/1/3/4/0/134012647/vifenumalezires-vibak-pukaj.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/gusibodagubov.pdfIn PDF document text
    • https://kademagora.weebly.com/uploads/1/3/4/8/134850034/82a97.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/xolifowogute_sizex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_606e438536c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_5fd79d466301b.pdfIn PDF document text
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/labelatusazavubas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fdf7acc14f3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/senorita_shawn_mendes_and_camila_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/serudesirun.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/how_to_reset_ravpower_filehub_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a814333-28aa-4160-aec9-49571b99495b/good_chess_app_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbc19a3-75a1-4acf-8360-40d272976d3e/moon_river_chords_fingerpicking.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/44429399862.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_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 5524 bytes
SHA-256: 0aa7bb1af851884a092ceecaefd32bc562797e87adf733843fffc91ec4678d5d
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 12084 bytes
SHA-256: 5284fe2121937710736fb6ff607efb9c60138c96096715827cbbac7a4093de26

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