Malicious PDF — malware analysis report

Static analysis result for SHA-256 28874d5a407ef812…

MALICIOUS

PDF

86.1 KB Created: 2021-03-17 03:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4d01b4980d3dca368302397877298cea SHA-1: a2187677a3d9eb6f2d77e3eb25025e7d38a51a1d SHA-256: 28874d5a407ef812ef13a1f7486b08fc31c12d898b43eb42dc52845d120c650d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://gimoguvi.ru/award?keyword=biasing+of+transistor+pdf', which is likely a phishing lure. The document body, though heavily obfuscated, appears to contain metadata related to wkhtmltopdf and transistor biasing, reinforcing the lure. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • 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://gimoguvi.ru/award?keyword=biasing+of+transistor+pdf PDF link annotation
    • http://bu-markett.com/livro_anatomia_do_fascismo76y81.pdfIn PDF document text
    • http://profibrend.ru/the_forever_war_movie_2018a5i95.pdfIn PDF document text
    • http://timurberg.ru/74450891529utehx.pdfIn PDF document text
    • http://newsportstechnology.ru/40720873486j3gxi.pdfIn PDF document text
    • http://praktika-ingenieur.com/27136532371iz04k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/voxazedisula/puwonaredodosexozisifa.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/biochemical_oxygen_demand_lab_report_discussion.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/love_couple_full_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/jemivexanila.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/58639401085.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/movies_time_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/31520231381.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kegagulixevisufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247a8624-8b39-4b1d-9b30-668e4336cd33/ruger_lcp_2_purse_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/bezoxapukok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19d4141-eea0-4d7f-9274-94f4b730acb5/hk_disneyland_map_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c2b433-a3f9-434e-9a24-2d69a96dbe21/how_to_use_a_margaritaville_margarita_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/jeviniramupubipa.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/16279392207.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/dlink_dsl_2750u_wireless_repeater_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae2542a-0d26-4b5d-8a1a-da5b74582492/what_is_place_5_themes_of_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9427386-380a-40ef-90d1-0aa57ec14882/how_to_fix_a_maytag_washer_lid_lock.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/zeradinazaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39da193a-ca9f-49ff-b8b5-38d93511efd9/cuntas_veces_es_normal_orinar_en_el_embarazo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 4896 bytes
SHA-256: 3857c9a47362cf53f0794068ed64b7a28fd039fd8c9420c31f7a4066ff168cc0
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 11140 bytes
SHA-256: 88813d4ab35608f53f42cd603edf1c158eaa84117e391cb658cccdc0af9b2550
font_02_sfnt_off0001273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 16168 bytes
SHA-256: 272e514f9476ad5cd2c4d41db085ae12b690bbce6a01a77bc2293bec534ca399
font_03_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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