Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f43f3930d5398e…

MALICIOUS

PDF

75.7 KB Created: 2021-02-13 11:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 841bee1faaadf015afcd50a0ae421066 SHA-1: 595fbfa8d2d7dbb124d43b7202e73779daa77661 SHA-256: 37f43f3930d5398e6c308c7a5e4e946f82bcb96eb1a45dbe5aed7199b6701c8c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crophysi.ru/wix?keyword=phantasmal+force+uses+5e PDF link annotation
    • https://cdn.sqhk.co/sepolulegaba/ggh7gfO/samurai_flash_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/fBZ0ibh/rutozamiwibafurotoziwibuv.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/1XicMIa/counting_games_for_preschoolers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/Zhijdjf/sling_tv_channels_list_blue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fe6ecf367a9e.pdfIn PDF document text
    • http://dresdenpharma.ru/kuwanojatofzxaij.pdfIn PDF document text
    • http://praktika-ingenieur.com/toguliwelodakibog2hws2.pdfIn PDF document text
    • https://cdn.sqhk.co/joxezexukub/wjejfhb/cheech_and_chong_bud_farm_new_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/VCihjb8/40396053162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fd1d10ccfed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merapuw.epizy.com/data_analysis_in_educational_research.pdfIn PDF document text
    • http://bakevojedu.epizy.com/money_envelope_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/tsc_bartender_ultralite_version.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/43524807667.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/free_cash_envelope_template.pdfIn PDF document text
    • http://bamasagure.epizy.com/75668380740.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/78107609391.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/19326020004.pdfIn PDF document text
    • http://vefugiw.epizy.com/23566951480.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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 5244 bytes
SHA-256: a0158467beb1730fdce29dba5b0863b7e07d1e87cedbf8dc2851083e18830318
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10796 bytes
SHA-256: e8550fc5ff8f8a86ef4d1a12d9761abf114d78538718c9e1b5c6e289dd670d5f

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