Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0452c8861ebe471…

MALICIOUS

PDF

75.5 KB Created: 2021-03-07 09:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b64b656805c447c349b9824f87c42cc0 SHA-1: 562b10712d488b6effc127ba9f381772c72fd141 SHA-256: d0452c8861ebe4711711fd1289f8febde67bbb6f3b2dd52ddcf40ce5d9a6cb19
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://baarspo.ru/wix?keyword=ear+ringing+omen+tumblr PDF link annotation
    • http://znakomstva69.space/bluetooth_exe_for_windows_7mglwc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5ff43a3c360cf.pdfIn PDF document text
    • http://kirademom.22web.org/how_to_roman_numerals_work.pdfIn PDF document text
    • http://eurozone.pro/mudurovazevifozuw3qy1.pdfIn PDF document text
    • http://zofazosedam.iblogger.org/how_to_turn_casio_watch_alarm_off.pdfIn PDF document text
    • http://alcexpress1.xyz/bradesco_seguro_auto_sinistro_terceirox7twc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6027236de1332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_601d248c96d4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5fc9be6c44faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5fe8008d2130b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_60354542cd0bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6007bc7251ad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_602adc26f39eb.pdfIn PDF document text
    • http://profapp.pro/51605512058se2xk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89b8288-6a4d-45a1-b96e-bd5f37c3b278/what_are_the_specific_advantages_of_database_management_system_over_traditional_file_processing.pdfIn PDF document text
    • http://bisavosimirot.rf.gd/driver_ethernet_controller_asrock_g41m-_vs3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de1eca9-1b49-490a-a55d-8b8419eb5b5e/83481938300.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/sevedusunagamokul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225b39e8-1d36-45b9-b44b-82c4b235485f/how_do_i_change_the_time_on_my_g_shock_5522.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/21221988239.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 4924 bytes
SHA-256: 9736f1e73658d8f8cca4079934d15f4eed94cf5148174713955b213a7f247c1f
font_01_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 9996 bytes
SHA-256: 4c458698f1d47b427f46a5720dddbff4971018da3925d0173403dbad578b5296

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