Malicious PDF — malware analysis report

Static analysis result for SHA-256 c008dc5c730d5cc9…

MALICIOUS

PDF

79.5 KB Created: 2021-02-24 20:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 608f2edaf194172163088e9cbe719681 SHA-1: 2e03495c0246008b3bba6e4e6d6d85fc12f710d2 SHA-256: c008dc5c730d5cc9243db834df5f293d47b737d00cb3559869fee71766d97abe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Blocking

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to PDFs, suggesting a link farm or content distribution network. Notably, the document includes an instruction to disable security software, a critical indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://baarspo.ru/123?utm_term=troy-bilt+bronco+riding+mower+drive+belt+installation PDF link annotation
    • http://sowoxapexemex.sportsontheweb.net/edward_said_crisis_in_orientalism.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/4775000.pdfIn PDF document text
    • http://eu-study.ru/guitar_body_templatesatqfe.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_to_do_if_you_fail_pre_employment_drug_test.pdfIn PDF document text
    • http://testvvd.xyz/english_adjectives_prepositions_exercises2ftle.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/dtED1Jb/44964562977.pdfIn PDF document text
    • http://awpmode.com/private_practice_season_5_episode_10_casto4whe.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ichchfZ/craftmaster_homes_magnolia_green.pdfIn PDF document text
    • http://swiss-family.space/pulifude7sfyi.pdfIn PDF document text
    • http://tryadasert.online/cd_formatieren_windows_7lx4ya.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/jamuluvuvava/92347164395.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/radexukiferewujusulinivi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/yaesu_vx-170_manual.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/xawoki.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/which_garmin_handheld_gps_is_best.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/35688903231.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/35460707424.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_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 5632 bytes
SHA-256: 29464e184f1233a324ccbd9a8bbacdf86d28443a32c9265e88b880323394510c
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11056 bytes
SHA-256: 1e73667c800a65726bfeaba86bdd816b76e6685de2e1a68fec99addfbf1b995c

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