Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fce55f1f03d221…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 03:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e78986019e338084bcdd83a80b568af6 SHA-1: 84f9ab204b4e33db23c0e21e95f7bb309ec0b425 SHA-256: b5fce55f1f03d22122891da4498c941697756923ceff025efa8c79f33acdd502
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=viking+outdoor+grill+repair+near+me PDF link annotation
    • http://loxuzemifa.iblogger.org/supowulizuwan.pdfIn PDF document text
    • http://apeech.ru/voxovelerafexupotiq2xy.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jd2jjb2/60639499263.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ehfhgjk/39480775156.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/best_sheet_masks_for_anti_aging.pdfIn PDF document text
    • http://triple-doska3.club/xodusutapipepopukefapowi8l74f.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/2QgjUif/55850161562.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/JDKgeha/62068388267.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/cwgeOKK/isn_t_a_parsec_a_unit_of_distance.pdfIn PDF document text
    • http://paxedatomikog.22web.org/abigail_robertson_cbn_reporter.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/TPijWjh/84830941968.pdfIn PDF document text
    • http://prizinsta24.space/3d_cartoon_house_model_freefaavd.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/fokapikow/books_to_read_before_you_die_uk.pdfIn PDF document text
    • http://sixofiwezuxowa.epizy.com/54240579158.pdfIn PDF document text
    • http://fusezumapaj.epizy.com/soundcloud_api_track.pdfIn PDF document text
    • http://gojutudur.epizy.com/20320924982.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/latubi.pdfIn PDF document text
    • http://rexerikilo.epizy.com/38061040880.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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5132 bytes
SHA-256: 3c9309f88600dfa4e455458ef73af0206166e98b8598bd34729df639c5afd2ff
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10664 bytes
SHA-256: 6fb5831019e0b04185b846502606a3543adc4654b46c4215f14e0b98b6c8ab88

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