Malicious PDF — malware analysis report

Static analysis result for SHA-256 833873f263a9b5ac…

MALICIOUS

PDF

71.9 KB Created: 2021-03-21 02:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 323cc614097c04c8225504b4ba2cd306 SHA-1: 9773c2b9a0a4dfa40dd8471bbbaedda4c1a7a97e SHA-256: 833873f263a9b5ac9267316c606866c7d117b9ff3d3220e837d957321480fc44
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for spearphishing, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=mod+menu+gta+v+ps3+version+digital PDF link annotation
    • http://respect-ltd.su/melevolojupenelixolizul91xb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_60168fbf15705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5ffd6faa29dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_603cb55f25eac.pdfIn PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/639370ee60876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_602477fee7715.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/9756420.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/7e13909.pdfIn PDF document text
    • http://center-san.ru/massey_ferguson_35_diesel_for_salea0ufd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_604fb4ff42625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5ffd72e22ae23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370073/normal_600543e40a135.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/5f1288c3-6ec7-47dd-bac6-f308088abf9d/recipe_rainbow_trout_pan_fried.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814a285f-201a-4e47-ac96-e85a0459a4e8/breitling_aerospace_manual_download.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_c260fb92afca4674a56926fb34467fe7.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_5ee73749eb4a40f385b4ed3aef4c8b33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf1c355-12df-4133-b186-96540716eb02/67340003392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f5f210-21a5-440b-bfa0-a1c3cc71a516/64788743644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a85dc7b-2e5e-4eaa-b46d-bf6d921f4e3d/85540288999.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 5508 bytes
SHA-256: afb9979e8fd7205690bfcf05d00e5519be297f3bce2a7454d3181895f0946b8b
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10508 bytes
SHA-256: a02e9fa54be079682e1bb0f2a48425de4a742020112174fb55fc0f07d00a64d6

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