Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dd4623b9d5cac6…

MALICIOUS

PDF

69.7 KB Created: 2021-02-17 09:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 73ae5bac5151d10b968fbad7ad1fb0e6 SHA-1: f8895d7593d75b56afd4f2c3aa5ca775508c71d8 SHA-256: 77dd4623b9d5cac6b8db8dad85b9b6927933d513ab35b871488a5177dd26d10e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with a primary suspicious URL being https://baarspo.ru/wix?keyword=btd+5+unblocked, suggesting a phishing or malware distribution attempt. The document body's content, though heavily obfuscated, hints at a lure related to 'Btd 5 unblocked', aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=btd+5+unblocked PDF link annotation
    • http://nazukubilonoj.22web.org/gularagiraxenubum.pdfIn PDF document text
    • http://francobusiness.com/action_plan_for_employee_improvement_templaterq5jp.pdfIn PDF document text
    • http://100p-f.ru/beautiful_girl_wallpaper_pictures_1080pmf9lq.pdfIn PDF document text
    • http://goodsun.space/prince_ali_sheet_musicqadoj.pdfIn PDF document text
    • http://moresukko.ru/83235313045txy49.pdfIn PDF document text
    • http://medicinfo.online/procol_harum_homburg_piano_sheet_musicjk6rh.pdfIn PDF document text
    • http://opencabinets.xyz/bolens_tractor_parts_lookup3m8yj.pdfIn PDF document text
    • http://umdtheatre.ru/whatsapp_online_trackerkmfmm.pdfIn PDF document text
    • http://sallles.ru/dopizidajalikalw5u9b.pdfIn PDF document text
    • http://fitit.space/antrenmanlarla_matematik_2_zmleri5y9vg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likasiz.epizy.com/83454377928.pdfIn PDF document text
    • http://jipowefata.epizy.com/19087150690.pdfIn PDF document text
    • http://fufinekudag.epizy.com/63698432258.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/tushar_name_ringtone_with_music.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/bajonizegizekiz.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/news_article_title_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/5930203597.pdfIn PDF document text
    • http://rinafuladimuk.epizy.com/54495698387.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/sonipobonekamevemibixefop.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 4828 bytes
SHA-256: 68c8141e5c19e7477452e2333588019fa5973d296511707952d0872e321dd535
font_01_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 11156 bytes
SHA-256: b5c52f74afcc7cfeb39aa3b8649e3916ed69a7bf91b97246db019f4875fba3ad

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