Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf9139436b11a4c…

MALICIOUS

PDF

89.9 KB Created: 2021-02-24 09:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8cb26f041dc0683a97143f3b6497de73 SHA-1: ac69f94d9a43f0c78f9bafa93f208de783841be2 SHA-256: fcf9139436b11a4c0eff7723841800d3540ec5e775dbb9e6fbb3a0afa22538f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=%25D1%2581%25D0%25B0%25D0%25BC%25D0%25B0%25D1%258F+%25D0%25B4%25D0%25BB%25D0%25B8%25D0%25BD%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2580%25D0%25B5%25D0%25BA%25D0%25B0+%25D0%25B2+%25D0%25BC%25D0%25B8%25D1%2580%25D0%25B5+2020 PDF link annotation
    • http://graatorama.space/piridaligol4a55s.pdfIn PDF document text
    • http://pet-guru.shop/nofaminazqx8sp.pdfIn PDF document text
    • http://bapaweki.22web.org/58012747303.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/gcschaW/25964107231.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/35965188178.pdfIn PDF document text
    • http://momijuluxesapek.iblogger.org/pfma_annual_report.pdfIn PDF document text
    • http://energierecrute-emplois.com/idle_heroes_brave_trial_shop_guide0ohjk.pdfIn PDF document text
    • http://xuputunoxukir.22web.org/a_p_john_updike_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/yhhjgjh/divarication_of_recti_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ifejigd/41015448872.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jigihjg/tiktok_video_downloader_no_watermark.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/bJyVLmV/top_mens_fall_shoes.pdfIn PDF document text
    • http://gefavofatefazis.iblogger.org/harry_potter_and_the_half_blood_prince_chapter_13_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/hmJaRX7/funny_dog_pic_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/VG1oeGd/zediremixabite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilovin.epizy.com/44112608250.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_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 5644 bytes
SHA-256: ca3c60b128b75e94ea21a2a5c5b1ed9b76402358090d2aae0085302894e99eef
font_01_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 15964 bytes
SHA-256: a563c49ffa207aad88df01bf87b7a20bbf0d0cdbbafcc37e1aa472417f745d7f

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