Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c12145f1d90cf0…

MALICIOUS

PDF

72.1 KB Created: 2021-02-26 18:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 59734b3c634d1443ecedf90987f3bdbd SHA-1: 4d01e2829c828a3a523c838428c077082d21807e SHA-256: f3c12145f1d90cf0ac631c9f956bab55bf3bd7a00bc6bb067a3d638b605134b5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs, with one prominent example being https://baarspo.ru/123?utm_term=harry+potter+book+1+uk, suggesting a phishing or malware distribution attempt. The PDF also exhibits characteristics of a link farm on disposable hosting, further indicating malicious intent.

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/123?utm_term=harry+potter+book+1+uk PDF link annotation
    • https://cdn.sqhk.co/wavefekus/idPdiin/nifiva.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hdgjPge/29251221922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6011f5863039b.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jjObGge/67791520520.pdfIn PDF document text
    • http://afracheat3.xyz/gilirosajodojivonisuwakanmy3pc.pdfIn PDF document text
    • http://newsportstechnology.ru/10th_class_science_ncert_book_answers4vouw.pdfIn PDF document text
    • http://tokio-2020.fun/petsafe_bark_collar_manual_rfa-4420a9y5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5ff393fb5365a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_601f70f479d18.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/ja9Qphc/space_engineers_asteroid_amount_config.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fec6dc5ae4fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzotulerijenej.rf.gd/android_studio_set_debug_keystore.pdfIn PDF document text
    • http://parubixus.rf.gd/stickman_battleground_survival_mod_apk.pdfIn PDF document text
    • http://jatomije.rf.gd/android_tv_box_apk_apps.pdfIn PDF document text
    • http://muxomak.epizy.com/quadratic_equation_graphing_problems.pdfIn PDF document text
    • http://manisamat.epizy.com/aws_cli_ssl_certificate.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 4920 bytes
SHA-256: 7cea4d09ef0ce5c3391839a03ddebc5a794b540c4b9b21a2848c6f1e2c38c74d
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10520 bytes
SHA-256: db9a6a0d5a9b62331b22d5883754d7f1100d82ad446d989e045c690e79e4997a

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