Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7c4f4d005b2a23…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 15:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02f6f3c473deb51102fd7f4b4829ba90 SHA-1: 351bb31a89e3a3fad896d72d08eb36813c436845 SHA-256: 3a7c4f4d005b2a23d2738dbdc29437d910c92c06bb6d12b9eb2d5996d247ae77
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm heuristic further supports this, indicating the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=apicultura+en+ecuador+pdf PDF link annotation
    • http://setofexperience.site/mbti_test_italiano8fua2.pdfIn PDF document text
    • http://ses-paypal.com/85925387790s5oje.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/how_to_fix_a_bad_fan_clutch.pdfIn PDF document text
    • http://susurrus.space/los_juegos_de_ps4_seran_compatibles_con_ps564k45.pdfIn PDF document text
    • http://xiwefugu.iblogger.org/contax_t2_battery_cap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60199949991f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_602badf5c9e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_604fbbdcb52a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5ff6366b0bedf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_5fdc6c66c8f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_6041bb78c1104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5ffe15038e7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fd29ca4358e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fe310d44b5ce.pdfIn PDF document text
    • http://nupubidodeje.22web.org/nutunodurinivaxure.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/luzufavatak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sujotoginejo.rf.gd/define_gaming_platform.pdfIn PDF document text
    • http://tasobigadegef.epizy.com/vexikanawobizoj.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/spoken_english_course_video.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/tularojopexux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 4844 bytes
SHA-256: c0e624d3db4b80848683a33c04082f7acd4554c8bab6a95b3e1f5e3959f39f2f
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 11788 bytes
SHA-256: a08d2531ad9e5603c89a1e702c054a7f32df565517366d230c165730aefa48ba
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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