Malicious PDF — malware analysis report

Static analysis result for SHA-256 a060c7eae1db220d…

MALICIOUS

PDF

83.8 KB Created: 2021-04-01 20:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c72ba5f97bc5c814f1d6c889ad40ed9d SHA-1: 0bf788dca0d2e5563e351c90414b190c9cd9d95f SHA-256: a060c7eae1db220da6d8fdbd99caf7c00f75c811e1b403f62984f69a2e0677bb
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a notable heuristic indicating it's a link farm on disposable hosting. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to trick the user into downloading a malicious payload, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/award?keyword=tnpcb+assistant+engineer+syllabus+2020+pdf PDF link annotation
    • http://lolkek.xyz/80617260140u5cdg.pdfIn PDF document text
    • http://barberking.best/75228690681y2ncj.pdfIn PDF document text
    • http://somukegizos.66ghz.com/naming_alkanes_with_substituents_worksheet.pdfIn PDF document text
    • http://ctyr.ru/sony_sa-ct260h_remote_app93x4y.pdfIn PDF document text
    • http://moperala.iblogger.org/90807808252.pdfIn PDF document text
    • http://stavki.link/rozigajizamusokuvgqgvk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rudozorutes.epizy.com/kejobonunubadoferum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327be0d8-007c-4c8e-bbd2-b525a44a5c05/97028537561.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_ee06ee264413485da4f6f73d2c791b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/64276850691.pdfIn PDF document text
    • http://lojupefiduk.epizy.com/21862084090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1324abae-ea7e-46b3-962f-74712826c143/27440865586.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_7fc708b11e924f11963ec37578a47ec0.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_cb594e3789ee4bc3b36dd48bdd44799e.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_36df64fa955a4385b09dcd5e29e5eb1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/78096338906.pdfIn PDF document text
    • http://sujidise.epizy.com/sejarah_kota_lama_semarang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5e5d63-f456-4ad8-b435-3c51ca4b4e2a/982341143.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/lijaxitizisisolewowamumi.pdfIn PDF document text
    • http://labubesasowil.epizy.com/kifub.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_e4c799fb582042e994a4a73c764fab07.pdf?index=trueIn PDF document text
    • http://betodufugesom.rf.gd/32578111838.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/maytag_refrigerator_model_mfi2568aes_ice_maker_problems.pdfIn PDF document text
    • http://piterar.epizy.com/medical_report_office_sgh.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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 5788 bytes
SHA-256: fa90977a3f57059e439d5c5e1084d0b728675631ea6f9cfc4bcd44d2c4baf116
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 11040 bytes
SHA-256: 4817adc7dd95611c4eb8bdadfa6b51a3200e274394123d87e76f93d72ca9ca38
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 16188 bytes
SHA-256: dd05f3a199ad2d978bd173fb45b380c6689d243adb5b122b9a9c20315e0b6377

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