Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52cf66acc9a9621…

MALICIOUS

PDF

65.9 KB Created: 2020-12-05 20:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e2472a25ca87b4771e400166dcc27cbe SHA-1: 6e85d6de645a639b54ee1069744dc1643f162b64 SHA-256: b52cf66acc9a9621f91d52094290e0b32fc94b9a0613b8bf4bb913e8ac5a26dd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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 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.
  • 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://traffine.ru/123?utm_term=tradiciones+de+honduras+comidas+tipicas PDF link annotation
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/6cbe68.pdfIn PDF document text
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/36e23ae591e.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/9871a1c6a.pdfIn PDF document text
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/6904504.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/fa80e467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc87c3cec83506b047be134/1606974534819/ragdoll_fists_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/boombox_jbl_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5617a914-5b2d-4319-9308-59dbe14f7ca8/85685322796.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/senior_designer_salary_range.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/jinegef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45024ba6-e7ad-41e6-896f-cdf984cb5ad5/3438807863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741bcbd1-da6b-42c7-a1bb-e0f4e954c369/diagnostico_socioeducativo_segun_aut.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/7698163038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dda8beb-b03d-46cd-aed1-c7e6ead7c3e0/army_quarters_regulation.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_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 5232 bytes
SHA-256: fe96f2523710ca4c5d1053b7692cbd4cd2308a3a678f76bb61fe58a092ba1362
font_01_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10936 bytes
SHA-256: ccd1f98475dba86538e572e7fc2d56bd495c87381a75e69510eaeb33dea69e34

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