Malicious PDF — malware analysis report

Static analysis result for SHA-256 4471c27ab1771c98…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 01:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 035ac5cae18ea2bf99178079e5dc814c SHA-1: 1c93cb33881b858594b611c4fc61652cb9fd065c SHA-256: 4471c27ab1771c980cb13741c4d68c8260faee055bf3fc4c07e1f93cfc628ef2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF's content appears to be obfuscated or corrupted, but the presence of external links and the high ML score indicate a malicious intent, likely to redirect users to phishing sites or download further malware.

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://zajinet.ru/award?keyword=braun+brewsense+coffee+maker+instructions PDF link annotation
    • http://e-sparks.ru/xozefazefesuh3eql.pdfIn PDF document text
    • http://outputqwvk.space/fijifowunoh7c2d.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/does_wii_have_hdmi_output.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/xisebonofugidema.pdfIn PDF document text
    • http://bigwin-1xbet.fun/disable_adobe_acrobat_dc_sign_in_popup7prvl.pdfIn PDF document text
    • http://bewagubidebesun.iblogger.org/tugamor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6031671bf370e.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/mifizoviridam.pdfIn PDF document text
    • http://alcexpress1.xyz/didonampvums.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/hopper_with_sling_model_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fdfc3e206f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_602b6eba7ff4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kurejaj.epizy.com/what_pascall_lollies_are_gluten_free.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/tokozifegiw.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/sylvania_portable_dvd_player_charger_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/moresozuni.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/how_to_calculate_molar_mass_of_a_compound.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_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5340 bytes
SHA-256: 9f7e0a2c105a4cbfb77da7880c59adfcc95a61294ac0bc4f5e207ca506fe1e7b
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10296 bytes
SHA-256: 71b3ae2071bdb8666a087ec11a8a36871a95e26beb338ceeddededcf60a070b9

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