Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73162f9f72487f3…

MALICIOUS

PDF

90.2 KB Created: 2021-04-02 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4e002b32a491c8a91df6c9ac55a7627e SHA-1: b61a7926d2367bb049a2e2823556518432d26c9e SHA-256: d73162f9f72487f34ea24790cc975c5c76ecc8adf1a64d467ac7f35828ef47e7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is flagged as external. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly suggest malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, contains text related to lesson plans, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=detailed+lesson+plan+in+english+10+pdf PDF link annotation
    • https://cdn.sqhk.co/wadusazilox/BvjhSjc/zee_tv_serial_ringtone_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/gkJijHz/xujeduwalelazotazire.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/e0yNhet/dwarf_fortress_defence.pdfIn PDF document text
    • http://tonufunevozapiv.iblogger.org/how_many_calories_does_a_medium_sweet_potato_have.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/ihhdjgP/35845514892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6027284ce2c8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_6003e1c69ad3c.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/xunilukegez/denon_avr_s900w_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/tet_2018_answer_key_maharashtra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f841e2-a7c0-4be4-9a24-36e19c1a3675/how_to_assemble_a_metal_futon.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_a00880ef577a48a5a404fc030f8c137d.pdf?index=trueIn PDF document text
    • http://sinomol.epizy.com/medicinal_chemistry_books_yogeshwari_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e726bee-829c-4993-a94e-0820a3cd2b76/players_handbook_dungeons__dragons.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/dareruwoxoful.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_3212972c2a6d44b5a5bdb90f20472bc9.pdf?index=trueIn PDF document text
    • http://fulariponazaget.epizy.com/swot_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14df6637-60fd-463c-ac50-57365811c83c/creating_a_psychologically_safe_workplace.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_13f492b7aaf043b2a2be97aa32a19620.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_de58e59687c24b6cb0146783044aef6c.pdf?index=trueIn PDF document text
    • http://remavolef.epizy.com/67736360183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9042ae6-ae35-432f-90db-22406281c8d4/aroma_rice_cooker_oven_safe.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_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 5400 bytes
SHA-256: c70bdd9220a44998128e7e51f3f3429c63483a11eb4854272ce6a8fc971f4181
font_01_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 10880 bytes
SHA-256: 86d8494e958a09bf6b0036a89a50e44d968dd2197a7eacbceb24b83ee36a4f6a

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