Malicious PDF — malware analysis report

Static analysis result for SHA-256 f104d2a7740fa3e7…

MALICIOUS

PDF

84.8 KB Created: 2021-02-24 10:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf803804e4fc4b57b268123c9ad405e SHA-1: eecf257cb87e11e4d8f7d859a2987a0b8b631ed6 SHA-256: f104d2a7740fa3e722570edac0c41d1ec451d0970aa42b2fab3907a24c5534ae
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure ('yafferge.ru'). The document body, though heavily obfuscated, appears to be a lure related to guitar tabs, suggesting a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+easy+guitar+tabs+for+beginners
    • http://titoto.xyz/online_aa_meetings_area_72i6gkl.pdf
    • http://premiumpornclips.com/43206282645jtafw.pdf
    • http://torchland.xyz/pago_movil_bicentenario_descargar_apk96l0s.pdf
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/15bf2b330.pdf
    • http://cancandance.org/43739336906xfc57.pdf
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/vezasozajazazomej.pdf
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/radewijalawuwagejope.pdf
    • http://pet-guru.shop/pelimijbzyrw.pdf
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/797d9b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luremugaxufarup.epizy.com/bulk_sms_software_free_for_pc.pdf
    • https://s3.amazonaws.com/wumodukubaru/freeswitch_configuration_guide.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/the_apostolic_fathers.pdf
    • https://s3.amazonaws.com/pokixovuxik/45690242136.pdf
    • http://danijikuguwidak.rf.gd/google_sheet_goal_seek.pdf
    • http://tumaselopewebu.rf.gd/original_marksheet_sol_du.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_off0001117a.bin
5ce724a66ff51553dcfc9e597fe6c3c068eae2c4bd478d8921bbeb0e916023cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 5252 bytes
font_01_sfnt_off0001236f.bin
3e03d7ffad53238c5839172d572d3f19d967e1f4d6dc1af40a1ab831628bfe0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 10104 bytes

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