Malicious PDF — malware analysis report

Static analysis result for SHA-256 af026301170931f6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 02:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f7bb916c75cebb12f6d29392bd28536b SHA-1: 9f43de05a2f24b14cdca3a5d918ec0f84e3c944c SHA-256: af026301170931f6610cd699f305e2a8cd5e4be8e2e662ee84b613c16663ef2e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, including one pointing to 'jumiwimov.ru/award', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=aryabhatiya+pdf+sanskrit PDF link annotation
    • http://wisecreditscore.info/magadavb2kpd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60199da7b9294.pdfIn PDF document text
    • http://power-guard.shop/91425725773m7dg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_600ef0e5a56a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6035ed237d6ce.pdfIn PDF document text
    • http://letogala.iblogger.org/76617053522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_f62a509b5e174e9f9a8c7c3abbeaedfc.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_ede25dc76cd14ae6a01f753d899ace67.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_56e6e322373a42e896364834d1d51b32.pdf?index=trueIn PDF document text
    • http://dukudolit.rf.gd/61408915048.pdfIn PDF document text
    • http://sowabufiki.rf.gd/nelewazikolarewilupizo.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/coping_skills_in_addiction_worksheets.pdfIn PDF document text
    • http://worubag.epizy.com/ecsa_registration_forms_candidate_technician.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/honkai_impact_3_luna_kindred_guide.pdfIn PDF document text
    • http://wowadowir.epizy.com/mifamawukisopirizotalo.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_ade2038c7f0844c2b84f62a481d45cbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/papovifikonejo.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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 5392 bytes
SHA-256: ed85b0b34188c5f3ffd9d50bc5e09dea6b54a7d708afc968d1bcb828672827ab
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10640 bytes
SHA-256: 0a35124d4cc36b2945b5dde5cecc8db08f713fcc5148bd61208d279f8977079b
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 2956 bytes
SHA-256: fd56cf09430b04d22665fbbb9681f2b78720cc3b0b593e0b9b22bfc343058d12

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