Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2e90f0248f0af6…

MALICIOUS

PDF

74.9 KB Created: 2021-06-12 23:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b546adf883e6f26e84d1f1ebc8df417 SHA-1: 21b9e65be6b8526b0fab4ba59084708512463fed SHA-256: 3b2e90f0248f0af63fd570d74bd963c2c54551ee2ae910e19da64edd46f0a5c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/pbw?utm_term=if+with+past+tense PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459188/normal_600bc94f8dd2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_606029f88617c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_6065b0077ab70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_6019a213a4f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_6036d625bf313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_60311a94f0c55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff55e1c67a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6012c00636ae4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokemomonu.pbworks.com/f/sukijonivovisakisokusefaz.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144514266/42843379001.pdfIn PDF document text
    • http://subazim.pbworks.com/f/physical_science_grade_10_study_guide_download.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144729945/12254214663.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/144599829/modern_database_management_twelfth_edition.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/w/file/fetch/144509682/desarrollo_del_nio_y_el_adolescente_compendio_para_educadores.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144614787/migamimesizesodokirupuma.pdfIn PDF document text
    • http://goxuluk.pbworks.com/f/subtracting_fractions_with_mixed_numbers_and_borrowing.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144588177/381869307.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144442614/79032524349.pdfIn PDF document text
    • http://pefumugat.pbworks.com/f/biology_exam_questions_and_answers_download.pdfIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144852045/hierarchical_cluster_analysis_sample_size.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 4892 bytes
SHA-256: ab9c179157efe63c51e67dc618b28b99ff0f1999e36b6469a69ef37b1dfdb12f
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 10876 bytes
SHA-256: 1b3261533db6448f6c7b591f2124caacef94bc6c767d57e39bbe5f7d29a4b6a6

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