Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c097779c6879aae…

MALICIOUS

PDF

74.1 KB Created: 2021-02-14 21:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 73962dce72466e485d81a5e0580cdf94 SHA-1: 2b38aa2283d8e66c4f0a59413b6ab3bfba715880 SHA-256: 0c097779c6879aae177f0ff4ea1cc90ffac86a301e3ca04d38403e64399ca34b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content.

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://leonvi.ru/123?utm_term=osrs+glassblowing+profit PDF link annotation
    • http://miwodenexiz.iblogger.org/xabikijawepuvimiwe.pdfIn PDF document text
    • http://kawlites.online/dasopurezanupuwermrrdr.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/bivoborepixixip.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/bewuzitevozumagixot.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/I3gjRL0/diamond_cut_rope_chain_vs_regular.pdfIn PDF document text
    • http://letxxnx.org/mplab_tutorial_for_beginnersd9a8z.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/dAqCBie/17982061858.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/Tvbgcgi/56466996663.pdfIn PDF document text
    • https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/f85404f.pdfIn PDF document text
    • http://im-marceting.site/fowiluzoky5en.pdfIn PDF document text
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/mulibil_samipesosowus_ninaraxavimido_wiwowezi.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hijZiiN/62027257441.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/fanasuluwere.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/jevedijadiki/anteproyecto_ley_del_deporte.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/muruzufupamegomakefofa.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/iron_man_3_theme_trumpet_sheet_music.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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5328 bytes
SHA-256: 97c04399570660c100a1cddda20c771033720a06048f38f657386573ed9be6b8
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10624 bytes
SHA-256: 4dfd81dbb4510c41d8c8ef46a4fb70fdd4b9ddd90848827308174cce8b5f5b97

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