Malicious PDF — malware analysis report

Static analysis result for SHA-256 7437d9506c2ed5b1…

MALICIOUS

PDF

65.5 KB Created: 2021-02-15 10:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 74e4a84f9b2b736d07f1c8ea189337ef SHA-1: 961c68a07e75edcb3970cffa59e8e0d61cad190f SHA-256: 7437d9506c2ed5b1e35a7c3dc060889fb0072107f0f68ee6d61a909dd08185ea
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://druttle.ru/aws?utm_term=fundamentals+of+financial+accounting+phillips+pdf PDF link annotation
    • https://cdn.sqhk.co/jogekiluse/hgfhcO0/indoor_dirt_kart_racing_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_60133e558e88c.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/greek_lexicon_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_6017472129739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5ff1f5689f92f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369498/normal_5fc88ea5366bc.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/ijTvVru/average_cost_of_dental_implants_in_florida.pdfIn PDF document text
    • http://bafalumej.iblogger.org/97217991837.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jbgfUlk/soxakinafukimedi.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/geLnbie/paneretof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_5fe9b74eb012b.pdfIn PDF document text
    • http://witogitozukifon.iblogger.org/muwapigerowovujesefeneter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedagavuvux.epizy.com/84706792394.pdfIn PDF document text
    • http://daxepusiz.rf.gd/faith_guides_channing_bete.pdfIn PDF document text
    • http://vowefaxi.epizy.com/c_competitive_programming_cheat_sheet.pdfIn PDF document text
    • http://keputeka.epizy.com/bypass_google_account_s7_android_7._0.pdfIn PDF document text
    • http://midelex.epizy.com/how_to_add_captcha_contact_form_7.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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 5428 bytes
SHA-256: c5d9794d102079263384335be7c93fb3bc8a47e63ce4e8a98b089b4395e6dd74
font_01_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 10164 bytes
SHA-256: 7e565fa1acc35aaccd56ae694c4f62ad1ce7c9a7e9779ca4ad4b6a3494b1b0e8

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