Malicious PDF — malware analysis report

Static analysis result for SHA-256 7819d64c8752c678…

MALICIOUS

PDF

82.8 KB Created: 2021-03-10 10:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c61e3d568d9954d12f853d67f6e5f808 SHA-1: 77d01115564756cc74c1265daf5810a5211c1edf SHA-256: 7819d64c8752c678157579597767c5c9496f5047b32f6ee7991bdce51fc64b7c
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains or using UTM parameters, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=how+to+use+black+and+decker+spacemaker+can+opener PDF link annotation
    • http://creditpm.com/51895750471p9sb0.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/zPNhdmu/rosataje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ff1757a88665.pdfIn PDF document text
    • http://pijebum.iblogger.org/how_to_afford_housing_in_san_francisco.pdfIn PDF document text
    • http://andyhongdigital.com/lejexubasiwasosasaq3zwp.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/rhhcggT/dental_assistant_salary_new_york.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6046d606848b4.pdfIn PDF document text
    • http://yourbigdick.space/beautiful_shayari_with_pictures_for_facebookgfc6q.pdfIn PDF document text
    • http://hdsamara.ru/saxajivepopeweji4ysk9.pdfIn PDF document text
    • http://options.expert/agatha_christie_poirot_booksljvzd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5fc8d6d28385b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_601459cf59e6a.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/4jahbib/flip_dunk_app_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_600e9673ce243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fd7f38d41eec.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/if09vhg/2673170963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5fec8bbb2b763.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/hajguQw/bench_lathe_machine_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_102e2e92fddb4b39a7ccb9e5606a08c1.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_b52faff4a34d42019c15c90eacb6d16e.pdf?index=trueIn PDF document text
    • http://tuladupanekeziv.epizy.com/wow_computer_hack.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_1ac7a9d0f228492d8cc05c4e02792c81.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_bc2c736129014a998efcf2cdec29804c.pdf?index=trueIn 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_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 5476 bytes
SHA-256: e1cab664611dde31a044af9b7faecb9b22ee40d6e08f4bfdc123e9493e20946e
font_01_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 11436 bytes
SHA-256: 58c40dd95baddfa269e98751c5427cf7184117c162bd9bd6fcef4c801e2e5569

Open this report in the interactive analyzer, or submit your own file for analysis.