Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f003e6d8dc1e6a2…

MALICIOUS

PDF

72.2 KB Created: 2021-02-11 05:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81de7ed812708caee7e48f2830100ac8 SHA-1: 2bdfea40e8df6bcc6f67f05262195dd2732a0db9 SHA-256: 3f003e6d8dc1e6a20c6e4c8cea865ee96991af48352ca166d39b07573be3114c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to download a secondary payload or redirect to a malicious site.

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=watch+lady+gaga+monster+ball+hbo+free+online PDF link annotation
    • http://luchdobro.site/gutukobigepewogituwezjtlro.pdfIn PDF document text
    • http://fitokaps.xyz/kutobiroduwugiz2it0k.pdfIn PDF document text
    • http://erogan-columbia.site/63160797470h510c.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/3451779.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/fhaiggh/cataclysm_dark_days_ahead_soundpack.pdfIn PDF document text
    • http://makamar.tech/awesome_wallpapers_free_for_pc6emsd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fed916a0d84f.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hjchfhj/terminator_dark_fate_2_trailer.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/pixefatogila_luxejobokawe.pdfIn PDF document text
    • http://cparta.moscow/bubble_bobble_2_heroda88b.pdfIn PDF document text
    • http://center-san.ru/49678756115ubn9u.pdfIn PDF document text
    • http://healthytrands.com/homework_3_transformations_graphing_absolute_value_functions_from_vertex_form_answer_keynzo0g.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/jLqge9C/wepafuwotezinagibojup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_6024103d9a859.pdfIn PDF document text
    • http://idealica-uficiale.website/mamulixojupatodidbs.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/jjige3d/litafinogaxavanefobenu.pdfIn PDF document text
    • http://avit0.cc/wididonutetitafucb0dp.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/278477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 5692 bytes
SHA-256: 60945f72f61b76cf04d8170f6a578a2c6e6eb313bb87ca30e0cee4f0e8c95f1c
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 11100 bytes
SHA-256: 663f9bb31f2a3e1fc0a59272a14848b8d3a0e9d9817460946d840fc5939503d3

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