Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf37f9753f7643b4…

MALICIOUS

PDF

69.8 KB Created: 2021-02-23 19:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 96fe9e20c978d7801f51bdc545924f08 SHA-1: f770b340a928b332e403b8033feb4259e4cea9f8 SHA-256: cf37f9753f7643b4d79e586e6bb3910cfc6fb47803fad7ebf9e7a8b7d6f108f8
186 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 a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains text related to 'Us army recruiting school', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=us+army+recruiting+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fd8171ea8009.pdfIn PDF document text
    • http://zubiki.top/27713977535r2h68.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/bolipuruwapulo.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/Fcgdgir/61069893192.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/hifghih/briefing_paper_template_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fe36aecdde61.pdfIn PDF document text
    • http://vk-settings-change.online/ahirani_song_remix4ru33.pdfIn PDF document text
    • http://netewe8.xyz/funosavumokixipuviminuwuyelf7.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/sixigonubuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/g3heQOl/download_game_2xl_mx_offroad_mod_apk_data.pdfIn PDF document text
    • http://islta.fun/65078353330ne8r2.pdfIn PDF document text
    • http://20970907.net/chirp_radio_software9d75z.pdfIn PDF document text
    • http://lnstagramverifycentre.com/how_to_solve_a_2x2_rubiks_cube_step-by-step4orrx.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/4b2ea903c9.pdfIn PDF document text
    • http://1xbets-reg.site/rosario_dela_divina_misericordia_del_da_de_hoym23oq.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/7geWiaR/lutolilup.pdfIn PDF document text
    • http://energytik.net/jegavemuzafipegu1qcq.pdfIn PDF document text
    • https://cdn.sqhk.co/juduxijumijo/hrQedhb/xufagu.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/bidoxadoj.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/pojukalowa_zalinazuwubules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 5304 bytes
SHA-256: 6f34decb9cdef6d89577132595885532e26fa96e169b916ada70da0ace7009e2
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10164 bytes
SHA-256: 621c5d2bf4f1cf129472286e3718d603ff6f6c5b862d9ff81dc5022c1b35de26

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