Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1346a21ee3f12e…

MALICIOUS

PDF

68.3 KB Created: 2021-03-20 11:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3504a0211582e99e7b654db981ef7c SHA-1: 8f51dcd29e2526185d4391ae0bdf7ed2e22d489e SHA-256: fd1346a21ee3f12ec301a7a10a2d080654989032bf571e7adbc425a79ec75e6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially garbled, contains text that appears to be a lure related to a 'violin ringtone'.

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://lozipotod.ru/123?utm_term=arere+yekkada+yekkada+violin+ringtone
    • http://kexipisibufexur.22web.org/business_management_skills_notes.pdf
    • https://cdn.sqhk.co/rodesedaded/A7jhhjE/desmos_graphing_polar_points.pdf
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe43451ea9a3.pdf
    • https://cdn-cms.f-static.net/uploads/4445341/normal_6041522a30336.pdf
    • https://cdn-cms.f-static.net/uploads/4378164/normal_60280699364ed.pdf
    • http://lupaper.22web.org/autocad_2013_free_download_full_version_for_mac.pdf
    • https://cdn-cms.f-static.net/uploads/4495696/normal_5fd713c9312bc.pdf
    • http://lerawutevokaj.iblogger.org/academic_phrasebank_john_morley.pdf
    • https://cdn.sqhk.co/rudixika/hnjhhlJ/9769595374.pdf
    • http://sunepoxuvigos.66ghz.com/bitovedamuw.pdf
    • https://cdn-cms.f-static.net/uploads/4403428/normal_600bd429c3827.pdf
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5fe8be1b45430.pdf
    • https://cdn.sqhk.co/kokuxisa/11ijGc9/perfect_ironing_app_store.pdf
    • https://cdn.sqhk.co/zasokolof/g2t2hdC/lego_41148_bauanleitung.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sonazorapabame.epizy.com/97411107487.pdf
    • http://gorefadusajog.rf.gd/61207861187.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/38481232453.pdf
    • http://mizizasuz.epizy.com/cuadro_de_la_historia_natural_dela_enfermedad_tuberculosis.pdf
    • https://s3.amazonaws.com/vifusupegiza/alith_anar_total_war_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3a.bin
35717aec9565f5992200f68ebbe0f758e8076368b2d75c77da881a29aba51860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 5032 bytes
font_01_sfnt_off0000dc7a.bin
81f85499ccd88138fa2a9c8c9015cfef6b21a25453e4277ef7bbda58db4228ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10920 bytes

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