Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa0d96fc7561135…

MALICIOUS

PDF

72.1 KB Created: 2021-02-16 08:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2060e503b32bf732bc8cd0dee22191e SHA-1: 75edb14dc555dd35bd9ed65701ea20e9db9892bb SHA-256: 5aa0d96fc7561135062f1735b9cd118543129ade7dee93d4999081a7990ff4a3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several pointing to disposable hosting and redirector services, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to obscure malicious destinations.

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=que+se+necesita+para+ser+padrino+de+confirmacion PDF link annotation
    • http://love-your-lips.online/bixby_voice_apk_for_any_androidepu53.pdfIn PDF document text
    • http://ledukamu.iblogger.org/52590921589.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/gche5jd/86661175868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5feceec8a0c9e.pdfIn PDF document text
    • http://ejqy.com/harry_potter_undesirable_poster_templateevtnm.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ijfuwjd/57639704025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_602554c5bcb1b.pdfIn PDF document text
    • http://emmetrix.net/22409724025tt8wo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601fd49c92eee.pdfIn PDF document text
    • http://yourcy.com/actividad_epileptiforme_interictal_generalizadaqnrw1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jagofebasej.epizy.com/best_cbr_reader_android.pdfIn PDF document text
    • http://vejajideb.epizy.com/in_telugu_video_song.pdfIn PDF document text
    • http://nedafab.rf.gd/fluval_a446_307_performance_canister_filter.pdfIn PDF document text
    • http://levolavajoji.epizy.com/tomek.pdfIn PDF document text
    • http://bozalusi.epizy.com/lixexivisurotidibizu.pdfIn PDF document text
    • http://sabozet.epizy.com/rekosoxot.pdfIn PDF document text
    • http://dufeniwa.rf.gd/batman_returns_snes.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 5332 bytes
SHA-256: 6fa0b10b1510730f91be121548e6c0e79d97af0709ff945a5dfe715381309a7f
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 11232 bytes
SHA-256: 2839c2939033dceb5970a8e2284fa70452a8e46c46a52b7d699e32d84b03d8fa

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