Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fda7f1e320af2…

MALICIOUS

PDF

86.4 KB Created: 2021-03-13 18:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cc0370e315deec399162bed5216664b SHA-1: 917448e0ac4634b9e7cd94f2963b06a7164b2691 SHA-256: a35fda7f1e320af2d911343db99ac590a152d389f3015bd005b614a087c0c4b6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=mental+ability+test+sample+papers+pdf PDF link annotation
    • http://wegisinebirixe.iblogger.org/58832484833.pdfIn PDF document text
    • http://vaxitowozi.iblogger.org/36132339542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_601921b52c676.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/eGhigjc/laundry_basket_falling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fc90d8e589d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fe8fcd4c8124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fcc896a24687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6044922f586dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_60318be02e8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_6036de2b0a65b.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/58hakie/52488802607.pdfIn PDF document text
    • http://wexexazemulo.iblogger.org/vudigujedewumetisat.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/HghGHVp/standaard_formule_sinusoide.pdfIn PDF document text
    • http://sebofafekorav.iblogger.org/tanaman_asoka.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/u7aEjf7/big_font_keyboard_apk.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7171b472-5164-403a-86d6-092ec10fd0ac/plantronics_bluetooth_headphones_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06287ff-56a3-4679-9b41-0a75a00729fa/rapekavas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03066249-e5a9-440d-b47d-2f2c39cf90cc/61733160618.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/73686345474.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 1656 bytes
SHA-256: 81718be160d5315f9a7b8d0e0acd78b44fd2e8beeefad998ac970215140f017a
font_01_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 5436 bytes
SHA-256: 4401cc02e23dfe189dec9312c67554a928f018ac6ceb731c56ea8a0d84bb1345
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 12232 bytes
SHA-256: 669ebcd597bd496105c0ed2aacee8da1f50f128dc05cfeefef674dd31d751c6c

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