Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbfd21f6464b31f…

MALICIOUS

PDF

82.0 KB Created: 2021-06-12 11:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93bef6d020f3622e8853d4ba1fb5d627 SHA-1: 53af37df4c7371c8df1af6427859ad61bec24499 SHA-256: 0cbfd21f6464b31f1052bd2983d12fa089cf950bfa749db54982b68b79b989bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a URL that appears to be a lure for downloading 'sst programming software'. The PDF's structure and embedded links suggest it's part of a phishing or malware distribution scheme, likely using social engineering to trick users into downloading a payload.

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://chcial.ru/pbw?utm_term=sst+programming+software+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459185/normal_601ad7f45c0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_60b9412bbafdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464724/normal_5fff0d964e36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604a93e783aa0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366630/normal_60b5b3c7eae54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/eb283a97-084a-4faf-adc1-6b066a8ff4f1/health_psychology_masters_research_topics.pdfIn PDF document text
    • http://disisopaz.pbworks.com/f/62712686531.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144712389/61580247186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2c9e7-7ada-4d24-9adf-84d592b714b7/xakujavosa.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/96403593110.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/145135404/28233841313.pdfIn PDF document text
    • http://lifabukis.pbworks.com/w/file/fetch/144806667/mipamuzajimagibimaxufija.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144515028/litestar_app_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6526f99d-8cd6-45b9-b01a-2d0e687b83ab/probability_and_statistics_for_engineers_and_scientists_solution_manual.pdfIn PDF document text
    • http://gezibilivun.pbworks.com/f/archero_hack_ios_reddit.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144983028/digital_control_system_analysis_and_design_4th_solution.pdfIn PDF document text
    • http://majemekux.pbworks.com/w/file/fetch/145096962/27010308479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd764892-d3b5-4bf1-bab3-506d7cc52b82/fijumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c99d0e6-c718-4a99-a5b4-5863a8ebd248/48884002723.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/145141170/dofodalininasuk.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 5344 bytes
SHA-256: 40831bbc52070aa0c3e6cb72687fdb5282b26c98e1cdde941a0e4ba5e336d7bd
font_01_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 11000 bytes
SHA-256: 263def5b9dcefed726e3f3355309dc79d8b742237d1b7e0dad73019b1fca8509
font_02_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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