Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b8cfe893465473…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 10:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102f9ced426755e8416c9ac1f1dd9ee6 SHA-1: 9dd8b95232822f17cdd7f614fa3226acde491028 SHA-256: 37b8cfe893465473d056cd60abe6266731f3a1eb77445242b2d3c1bcdab394db
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to downloads, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=download+uno+and+friends+mod+apk+revdl
    • http://vozupuwoxugug.22web.org/4588848949.pdf
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/dilorapod.pdf
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5ff0b77a5cbd6.pdf
    • http://modezewop.mygamesonline.org/az_103_microsoft_azure_administrator_book_free_download.pdf
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/3196572.pdf
    • https://mileboxizabov.weebly.com/uploads/1/3/5/3/135390970/xelikadosekagidumej.pdf
    • https://cdn-cms.f-static.net/uploads/4402478/normal_600d7e054cba8.pdf
    • http://jinevul.mygamesonline.org/58080248045.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/rujilezokugeduf.pdf
    • http://vobosivadujilep.22web.org/31711257488.pdf
    • http://justiciaforjustice.com/one_punch_man_release_dater603o.pdf
    • http://xivokosu.iblogger.org/36726598189.pdf
    • http://kenugizi.getenjoyment.net/tom_apostol_analytic_number_theory.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fdb0eed2eaa9.pdf
    • http://bitoxifa.sportsontheweb.net/16870252329.pdf
    • http://closemaze.com/80430141956sd238.pdf
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/429f16d9eea7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tulafixobokov.rf.gd/2015_toyota_camry_for_sale_houston.pdf
    • https://uploads.strikinglycdn.com/files/80d2519a-c64d-4855-8e29-10e71a63b1c6/what_does_it_mean_if_your_dashboard_lights_flicker.pdf
    • http://mufofizebad.rf.gd/how_to_program_dsc_power_832.pdf
    • https://uploads.strikinglycdn.com/files/4a889292-b740-45d9-aa97-a1a08040b248/fawitosojokejijebipim.pdf
    • https://uploads.strikinglycdn.com/files/5c18e3e3-b72e-4537-a869-eb757d0b4be0/24073954387.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf7.bin
3043200eed28e5f6f308f8b68d95c47273226eabfd0c1572b523cef7d0988cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 5400 bytes
font_01_sfnt_off00010065.bin
158160e9b90c2794897f3829cf729005eaca3a6144655eaf14abbae277cc8934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10656 bytes

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