Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e85a16b70b973d…

MALICIOUS

PDF

94.9 KB Created: 2021-03-06 19:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21f74f876838830288248db9e286bb52 SHA-1: a8b1e67626ca4f3096107ad18e467cd498766ba0 SHA-256: 52e85a16b70b973d6929e195ab654ad5177b70f486ce2834929f3c33803cca2f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a large number of external PDF links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=quadratic+transformations+vertex+form+worksheet PDF link annotation
    • https://cdn.sqhk.co/jutusaxibu/pkhiieM/soccer_football_fifa_star_world_cup_2019_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gjChEZ0/incharge_electric_fort_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/UG35unZ/hell_ride_2008_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/dhjmhfy/the_tiny_toon_adventures.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/jolituzoji/is_it_worth_buying_a_laser_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/osha_300_incident_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/18797816498.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_98ada5f4e7394e6699e351ba90f8fcc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/75043719258.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/arduino_mega_2560_pin_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/fovigobipuw.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/weiser_smartcode_10_forgot_master_code.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/how_to_reset_whirlpool_cabrio_dryer.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_6cd91c142ab54b29a7d98f212ad04b7a.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_59a363b3f223453188f0e76c71735bc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/3ds_games_rom_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/does_gravity_impact_height.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_88b9c80a999c4b199711c061f69a891b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/nofedoputeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c109547f-ca0a-49b2-b1dd-9687e676d50e/schaum_series_fourier_analysis_download.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_734dab1e6db347a49b6a693da319212b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecccee98-c7eb-4ed8-9ca8-4b33aa3febb4/energy_flow_through_ecosystem_ppt.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 5456 bytes
SHA-256: 0e6e6604f25c89c1b6f470960bac5f5c9ebd2f876c36c402570dbe317cd9237c
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10592 bytes
SHA-256: 0fff68e06c9795382657960e628a220d41596e9295a3dd90360696957aa5d94d
font_03_sfnt_off000148bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BD 16428 bytes
SHA-256: 6c2345b6d93458904955254a57f05533419983f996e14e875a300f00646a2eac
font_04_sfnt_off00015eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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