Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c56957e44dcfc97…

MALICIOUS

PDF

94.8 KB Created: 2021-03-23 22:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8d184bd8591c0ed4634ec9a9892f5e5c SHA-1: b601b0903d57c64206b35517f46a7ae44b99cc59 SHA-256: 0c56957e44dcfc979d331a308e5d5ba36bfe0cccf6db9e5a52612f90072edce1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://pelibifir.ru/award?keyword=cobb+douglas+utility+function+pdf. The document body is heavily obfuscated and unreadable, suggesting attempts to hide its true purpose, which is likely to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://pelibifir.ru/award?keyword=cobb+douglas+utility+function+pdf PDF link annotation
    • https://cdn.sqhk.co/melipetoluf/jfeRjef/rafowubusufo.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/djieG3f/medieval_battle_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/0M3Uict/assistir_furia_de_titas_1981_dublado.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/dGahgX8/affinity_plus_mobile_banking_app.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/9Yzihha/galaxy_watch_active_2_review_dc_rainmaker.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/CjexhfI/dark_quest_2_android_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/jhemvic/juzatero.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/fjghihb/child_care_service_management_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/duvhfii/teddi_mellencamp_kids.pdfIn PDF document text
    • http://detobusukited.iblogger.org/riwusexez.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/agdjjRc/sandbox_pixel_coloring_am_i_fat.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/69750252295.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/FPgginU/horizon_forbidden_west_pc_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/fomudidira/jRMw4UR/skillet_comatose_violin_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/4jhiihb/dodade.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/iewiehe/61649189095.pdfIn PDF document text
    • http://neriwozu.22web.org/windows_10_powershell_download_file.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/e5efb00c-a4be-4daa-b419-c68e603fba42/31111298090.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_85ba063eccd64543bf2f58fbafc5aadd.pdf?index=trueIn PDF document text
    • http://segoxegigo.epizy.com/5139868431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0038e921-7e5e-4313-8eb9-40483b09c184/kufototabafodola.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_32eeef84d0694ab6978e4847f9ccb5ad.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_d9a89e85198f4928af0b25670f38688d.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
    • 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_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 5372 bytes
SHA-256: 1daf4e31bfdec204ec12882ae3eabf75435012bfa9b96a31481605e9440a5344
font_01_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 13284 bytes
SHA-256: 01ad97704303bebe3ab9abf9835deb5f67affdafa63406b3e0bb0328d5d56094
font_02_sfnt_off00015776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15776 16320 bytes
SHA-256: 9d69001c20f65c1620ac853be09e76e0978a213e3354751e0214f406c722869b

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