Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9825f6a38cbc7…

MALICIOUS

PDF

84.6 KB Created: 2021-04-28 23:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e9db2cc6f3ecb204afe902d493e2dc15 SHA-1: ecc41fc06418ff39f253e57e3fe01c5102bd8016 SHA-256: f6b9825f6a38cbc753a508e197d23b66efc5e023cfe0072c25a0bd673076aef3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one pointing to 'golowaki.ru', suggesting a redirection to a malicious site. The document body, though heavily obfuscated, appears to contain text related to the URL's query parameter, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=why+does+ethyl+alcohol+have+a+higher+boiling+point+than+dimethyl+ether PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fcda425dbbff.pdfIn PDF document text
    • http://tlgfree.xyz/biblia_reina_valera_nuevo_testamentokmw3e.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/DajauNR/ar_ageing_report_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/c0Eigih/puwidilolorakiloxanif.pdfIn PDF document text
    • https://cdn.sqhk.co/vomofizog/ichfQgh/business_application_software.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/82MvYlQ/sevuzowev.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/gatazimibe.pdfIn PDF document text
    • http://sacredname.ru/87952470827wq964.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/asus_router_default_login_rt-ac88u.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/pusopedofixakew.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/9647247666.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/kabamadifaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_60218d553bb32.pdfIn PDF document text
    • http://e-devletodeme.net/12349366882h2g0b.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/guwegotodejusevozedaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ff0d0fbd427e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fdfa9460dba9.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/nakuzafol/area_of_a_circle_worksheet_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/wuferokojajabodoje.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/ziropuxiratiw.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/baghouse_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/tabla_periodica_blanco_y_negro.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/wodofadigimefironadad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5800 bytes
SHA-256: 7c98d7e41c6fcac520bd58184326072ff63ea3e8b5d0b9f92a78208c9d4fffa2
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 12556 bytes
SHA-256: 53ade11a72877189089496816230e58ca4c98b4d2d887f96ab87ae0c23aa4385
font_02_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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