Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb047a01f246d0bd…

MALICIOUS

PDF

69.2 KB Created: 2020-11-23 19:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4a198cb60739072d0c268df786d426bb SHA-1: db4070725db33893816138babf0837a91915b3b0 SHA-256: fb047a01f246d0bde9ac30b09e16df659a567605bd9c6187831b9711839c4fdb
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/strik?utm_term=super+mario+world+odyssey+snes+rom+d PDF link annotation
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/951d4a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5faf068f77e85.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/355214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fa6e1ff85506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f8b78871bd68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f8ab24f26dac.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/tomamujuf/pac_rp5_gm11_troubleshooting_no_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/12370912605.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/asset_allocation_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/lozaluki.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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 5400 bytes
SHA-256: 64b7ca8ee19173341d4614771bc4478263aa98e3ce53ff22de4106abec9c8a8c
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 10436 bytes
SHA-256: 02886b59845a48d567c3323377ecc120e0f6a9515d61c99c6a68ef2111a39f69