Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf332ca44cfece6f…

MALICIOUS

PDF

86.0 KB Created: 2021-03-10 09:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5e56f0579ffba64794e89b3d53e6ed12 SHA-1: 751fd6d4063ca99cc60eea41798be45ccfa710bf SHA-256: bf332ca44cfece6f05c29a011c3b4e1e9c13ff8b70e0c7768d1a4ab8bcdd0a88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('ponafet.ru'). Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing-related. The document body, though heavily obfuscated, appears to contain text related to programming a remote control, serving as a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/aws?utm_term=how+to+program+comcast+remote+to+onn+tv PDF link annotation
    • https://mavosawiki.weebly.com/uploads/1/3/1/1/131163846/8448129.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/google_play_services_android_tv_beta.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/problems_with_american_cancer_society.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/8e3a30a94c3b794.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/5808289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufituzol.rf.gd/write_text_to_csv_file_python.pdfIn PDF document text
    • http://jolagafo.rf.gd/akira_manga_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/divukavatul.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/steel_magnolias_script_free.pdfIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_58e5eb9de8f14dd4b5a61b4bcd38a1db.pdf?index=trueIn PDF document text
    • http://bibezakomi.myartsonline.com/wewezuvebezigoxekut.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/reading_ancient_chinese_chariots_answers.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/caps_for_sale_printables_kindergarten.pdfIn PDF document text
    • http://powejuzusar.epizy.com/vavonirim.pdfIn PDF document text
    • http://novoboninixeme.epizy.com/jofigefiv.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/realism_and_naturalism_in_american_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3add13-3fa4-4af5-ab0c-9e9f28d087b3/kala_journal_of_indian_art_history_congress_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db427972-1ae4-4c6f-be61-7567fe1bac1f/what_is_the_difference_between_the_septuagint_and_the_vulgate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b08f6f7-d37e-4381-999a-b19c92f1e739/stanley_jump_starter_directions.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_7b3fb6065b0b48728f6a54b999d2234f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/volume_compound_shapes_worksheet_answer_key.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/zokesuwaso.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_928c70c4646e4dd1a6634cff8d40f392.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_1ffc7880ba8644fbb2b0007a71a4be08.pdf?index=trueIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_b03b9edd579b459b8547c1c4c44381b9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 5332 bytes
SHA-256: a0b39955d20d409b3840e469ab51e320c99858512fe8e572182b14d02072dc81
font_01_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 10652 bytes
SHA-256: be94d556c441f0a0ba434c1e41c5644e080f2a2f001a9b77e3f5c3fc578e46a4