Malicious PDF — malware analysis report

Static analysis result for SHA-256 f212d7798422bc9e…

MALICIOUS

PDF

82.6 KB Created: 2021-03-20 22:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0295fb436baf64602b0077c31216e3e8 SHA-1: 410516f4f05dffc8440a3b3ed269ddb2b3d19b4d SHA-256: f212d7798422bc9ee7c6ebee609118c34161fe286abd0d4b9e8f31f37582c880
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically a 'PDF link farm', suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=valkyrie+guide+bdo+mobile
    • http://rodina38.ru/43391731212lsm8f.pdf
    • http://vashobereg.com/mac_cant_connect_to_brother_printerzymvi.pdf
    • http://1xbet-registrat.site/android_radio_button_example_stackoverflow8i90e.pdf
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/kadorotujixozodukiz.pdf
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/9395300629b8.pdf
    • http://tronreserve.online/jipanavefuxijufifevays4k2.pdf
    • http://fringigejy.site/where_to_purchase_singer_4423_sewing_machinejt7xm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tadevewuju/59552993577.pdf
    • http://gakajitaju.atwebpages.com/functional_job_analysis.pdf
    • https://s3.amazonaws.com/wudibirewuduto/bupabof.pdf
    • https://s3.amazonaws.com/tadevewuju/zomokibonipulusidebofow.pdf
    • http://tasoged.epizy.com/is_it_possible_to_install_windows_10_on_a_chromebook.pdf
    • https://s3.amazonaws.com/vuzotisenixava/anova_excel_template.pdf
    • http://kodowemomi.rf.gd/capacitor_start_capacitor_run_motor_wiring_diagram.pdf
    • http://fikelamizogu.myartsonline.com/normas_de_auditoria_independente.pdf
    • https://s3.amazonaws.com/zuponefi/libreoffice_math_guide.pdf
    • http://gefuwaw.atwebpages.com/adobe_photoshop_cs6_full_tutorial.pdf
    • https://s3.amazonaws.com/gavapozalilup/basha_tamil_film_video_song.pdf
    • https://s3.amazonaws.com/zamemigojat/york_furnace_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/xesigeze/employment_card_application_form_telangana.pdf
    • https://s3.amazonaws.com/lomogas/lagegewodusedalel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f849.bin
93fe1c4bd9bd975c63fd51b014e9095c898b38c801b4a5c6c9eb56c2fe8b0397		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 4936 bytes
font_01_sfnt_off0001090c.bin
d10c399c8e1b164330deba5c99f431bc1ddce5008dd37525ef8e549180c708fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 11368 bytes
font_02_sfnt_off00012f3d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 4324 bytes

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