Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d8b6956399ae3e…

MALICIOUS

PDF

89.9 KB Created: 2021-06-03 08:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 493f79dd838c813f53ca2e25fdb976c6 SHA-1: caa742a4ff3076e7089fc49ee8ca8a7df52eb425 SHA-256: 57d8b6956399ae3e08dc393a47ed3198600c03036632ebfab0d7156bcb0112c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=vagotomy+is+performed+in+order+to PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454170/normal_6055bcbfa99e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5ffed07708491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_60066c8550344.pdfIn PDF document text
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/fowuv.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/waginuk-mugeduzuleranu-pilumorew-xezaweseloka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fe18bad473de.pdfIn PDF document text
    • https://rezosegog.weebly.com/uploads/1/3/2/8/132814067/jopulesugofabelox.pdfIn PDF document text
    • https://bekawoxe.weebly.com/uploads/1/3/4/5/134529307/lukeren_xigagifi.pdfIn PDF document text
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/roremivitalikoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_601baf075bb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_604d28dfa5dc1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482027/normal_60b13966a43fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bc8331d10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/f/xaxitedik.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/how_to_use_mame_emulator_android.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/81607416481.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/sap_s_4_hana_abap_tutorial.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/clash_royale_free_gems_no_human_verification_or_survey_or_download.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144538848/programme_de_construction_de_figures_gomtriques_cycle_3.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/property_management_agreement_form.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/farming_simulator_18_android_apk_obb.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/wings_of_fire_rainwing_icewing_hybrid_names.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144469236/8540560326.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 5396 bytes
SHA-256: 7e18f9771dd26b4a64e5a575246a7fdd34edd2cfe688573217ec4cbcf9b25562
font_01_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 10948 bytes
SHA-256: 13e428116de31ba50387d51ff2608d3db7a93b3637084068b69ce2ed127431cd
font_02_sfnt_off00014514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0