Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39a4853e0ddf1f4…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 01:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b757aa2821a11ea74bc4ddbe1580ec8 SHA-1: 2067316fc24a1ec6e6f7082d6410c93767ed8991 SHA-256: a39a4853e0ddf1f43eeb98d976c2e3f19ef30f13e8935c5536fa7008ca7d2e67
156 Risk Score

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://lozipotod.ru/wix?keyword=guitar+rig+5+32+bit+download PDF link annotation
    • https://cdn.sqhk.co/pasivuzuke/hiagjjf/25260724158.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/jb8dtge/virt_a_low_carb_diet.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/9305975131.pdfIn PDF document text
    • https://cdn.sqhk.co/libidexa/MieKjgQ/property_management_jobs_near_me_part_time.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/kamekemuwilokigine.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/toALVgg/tafoduban.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/abridged_english_novels.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/ef5hhig/88181706161.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/Zijgfdr/modesto_city_schools.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/jjrgejj/29233720689.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/djhfQmu/pamumowali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_68d45f58a2384b35b92ba0e62d06a037.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/49367419600.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/averatec_motherboard_g31_drivers_win_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/android_nfc_api_tutorial.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_571c1c526dcc4d9f95efba05a37a0cfa.pdf?index=trueIn 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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5500 bytes
SHA-256: f4edc4683c5e2449b46efae6514895cbe7e617f15f234c329c50c4a0828afd56
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10860 bytes
SHA-256: 8fc8289904a83efe319ba8e7a71d0f5b22234106e07233f6fa31892fc910c690

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