Malicious PDF — malware analysis report

Static analysis result for SHA-256 065c020f11c3f7dd…

MALICIOUS

PDF

152.8 KB Created: 2021-03-25 00:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e3850e09c3099d7334422743ceae2081 SHA-1: 7bdbd87508e244c0490a2199c694374f3617fd66 SHA-256: 065c020f11c3f7ddf926a73f444c7e3c10caa92835adf644a8418d3c5a8f90ea
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'maypoin.ru'. The PDF structure and embedded links suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://maypoin.ru/award?keyword=vernier+caliper+accuracy+pdf PDF link annotation
    • http://topfrag.rip/schedule_d_2017_tax_worksheetp68yt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468551/normal_5fcdf63e49738.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/nometowigefulula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fe68cdcd9409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fd93e7a9d9e8.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/68084473749.pdfIn PDF document text
    • http://blekrossi.ru/what_qualifications_do_i_need_for_a_job_in_hri1fb0.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/gdrpNge/78420136693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe0b0dab0a1a.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/zNghRia/95950012591.pdfIn PDF document text
    • http://xozonline.ru/283041856819gpsf.pdfIn PDF document text
    • http://myfoxing.online/ludodetosobulaxopuguzsemiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b61d0caa5b.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/58lijjf/zatopobawiwuxexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_d7acc13b26644253a9c01e772db3593c.pdf?index=trueIn PDF document text
    • http://pigutun.myartsonline.com/zubukebeviwixololivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f791e83-3fbf-4df3-a59a-a7ddad3eecef/html_css_javascript_books_for_beginners.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_f8fa27f51ae34588a4723ff40d59e33d.pdf?index=trueIn PDF document text
    • https://a72a04b1-e5b5-4d9d-bdd8-34e053c51a64.filesusr.com/ugd/9c50a8_e454d375b00a4b1faf4d350caf464caf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd64f90-476e-41e2-b854-0de0a40165a1/houston_texas_sales_tax_2020.pdfIn PDF document text
    • http://jokajejuti.atwebpages.com/dufirirobenagotasuvaz.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_off000203db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203DB 5040 bytes
SHA-256: d6154ab4efbb9225c691f6d568471803e4666b318d107f5ba66660c9f55a51b5
font_01_sfnt_off00021520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21520 12956 bytes
SHA-256: 03c08923e1fbbb14bb72a39ea28c339d7d078ae82d7313697aa40e8c5cdb90e4
font_02_sfnt_off00023fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FEA 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833