Malicious PDF — malware analysis report

Static analysis result for SHA-256 346b274121295039…

MALICIOUS

PDF

125.4 KB Created: 2021-03-31 04:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 191bd1c9ebb56a3284785f4bf0c84403 SHA-1: 56bb2ace0cde6124362a814003c6a11d75dc778e SHA-256: 346b27412129503973db7c2648bc4eb43c0c5af6930f1e714e6edbe027a0be3c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or phishing lures. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • 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://ponafet.ru/strik?utm_term=indian+history+timeline+in+hindi PDF link annotation
    • http://powajaxib.medianewsonline.com/flying_aptitude_test_practice.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/aFQhbhf/4100754456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6061a1097a141.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/6VihjiV/xitizad.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/Uqgge4u/unfccc_biennial_report_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/gdjigdc/48530558575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445736/normal_5ff75d70d6d31.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jdigCgd/56659177554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5ff3502be4a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6038268582f4e.pdfIn PDF document text
    • https://perisabirazuro.weebly.com/uploads/1/3/1/4/131437425/4daf3a106.pdfIn PDF document text
    • https://boxudeso.weebly.com/uploads/1/3/4/3/134320939/nazifaramoluku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fd2a9c81ea47.pdfIn PDF document text
    • http://witomemu.scienceontheweb.net/marketing_project_for_bba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fcd712df2013.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/3569639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/luborinizu/material_science_definition.pdfIn PDF document text
    • http://dotopaku.atwebpages.com/tipirisukekubap.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/excel_vlookup_example_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/mojibujufadowikodemawu.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/interpreting_line_graphs_ks2_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0E3 5104 bytes
SHA-256: 1d1fccc60076dc5f6bc8e1c99d81d35de0c4c2af5bfb34746147aa32270965af
font_01_sfnt_off0001b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B216 12312 bytes
SHA-256: 9c8216c3ab914c9a86b3adc798fb66ee0b94b9250f8c2e7205cc4b7e1e71e7c0
font_02_sfnt_off0001db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9D 3156 bytes
SHA-256: 878f8ae43d98bfbd95b72b12e9e4179762c0a3444f23a687af9903acc47f0cbf