Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53639c2eae57737…

MALICIOUS

PDF

66.8 KB Created: 2021-02-10 07:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc79bb5673071fca25f09fd4b642da52 SHA-1: b9a9fc8ed5d2b6400d8985b63884ddfec849231c SHA-256: c53639c2eae57737f9c451f343859e6dc711d9ee665f848193117703f400bb44
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm PDF. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or content-luring attack pattern.

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://leonvi.ru/123?utm_term=lowes+plastic+edging+stones PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/a0gedvy/talking_catfish_toy.pdfIn PDF document text
    • http://aov.one/how_to_change_my_eye_color_without_contactsb1jbw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_600945727c3b6.pdfIn PDF document text
    • http://insurancesouk.com/88637811314eamyk.pdfIn PDF document text
    • http://lestyprin.online/fossil_watch_battery_size_guidejbddi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_60039b88270af.pdfIn PDF document text
    • http://yblda.fun/dawuzofiwikirividuhdos8.pdfIn PDF document text
    • http://worldthailand.fun/wotukexadovonanodavidufokss962.pdfIn PDF document text
    • http://all-system7.club/billboard_dad_torrentut5mv.pdfIn PDF document text
    • http://voyazh-shina.com/lldb_gdb_cheat_sheet12ku8.pdfIn PDF document text
    • http://shoop-fh.ru/clash_of_clans_mod_apk_apkpure6c2ln.pdfIn PDF document text
    • http://all-system7.work/cyber_security_incident_reporting_rbiezbmc.pdfIn PDF document text
    • http://naturwows.space/pes_2013_crack_1.04zwq0u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/35650372557.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/normal_whole_abdomen_ultrasound_report.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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 5180 bytes
SHA-256: 9093a455f91232ca78834fed8ee510f2972d4a64ae6851b3ba7fe7b13c96e76e
font_01_sfnt_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 9848 bytes
SHA-256: 6ec9f323efd4e5c1a4572502a0c2396455b1d86291538cafae830bd9165a8df6

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