Malicious PDF — malware analysis report

Static analysis result for SHA-256 39394a6028be9382…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 17:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d611ee2d1280c85c90283c635957d0c4 SHA-1: 9f14a61e74d613085596952ebfc09a2154b4a9b4 SHA-256: 39394a6028be9382bb24308f108ebecd5cac4ce311bb70916dd083c6ccea40bc
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'golowaki.ru', which is likely used to redirect the user to a malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'geometry worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=chapter+12+geometry+worksheet+answers
    • https://cdn.sqhk.co/gediwuwanol/jfbigSA/brain_balance_locations_ohio.pdf
    • https://cdn.sqhk.co/rugofufol/hjyDifz/bikix.pdf
    • https://cdn.sqhk.co/lekaguko/jiidgiw/aye_re_bondhu_ay_video_song.pdf
    • https://cdn.sqhk.co/dafisuwikib/dw2GWNN/4303194115.pdf
    • http://furafofuvobomu.22web.org/47714084491.pdf
    • http://fikodon.iblogger.org/munajolilo.pdf
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5ffa884874de0.pdf
    • http://vanesifonemume.22web.org/circus_animals_coloring_sheets.pdf
    • https://cdn.sqhk.co/jokawefezo/8CjegfB/81070086864.pdf
    • https://cdn.sqhk.co/balaragu/gmZhfgf/32407431442.pdf
    • https://cdn-cms.f-static.net/uploads/4454668/normal_603a580d58d1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://webomojewudel.epizy.com/bob_revolution_flex.pdf
    • https://uploads.strikinglycdn.com/files/50293721-a46f-4443-8846-95f59ca114c8/pifarudawuzoxuvisulixoju.pdf
    • https://uploads.strikinglycdn.com/files/c7da5214-f607-4771-997c-dd2ecc5e62d8/foxatasurisafinuza.pdf
    • https://uploads.strikinglycdn.com/files/43a1d0e0-bcfc-4192-823e-41d19ffc4c04/7558194307.pdf
    • http://tanorilani.epizy.com/casaleggio_associati_report_ecommerce.pdf
    • https://uploads.strikinglycdn.com/files/ad59aa57-d138-493b-98dc-396fd00c5646/how_to_reduce_high_blood_pressure_naturally_at_home.pdf
    • https://uploads.strikinglycdn.com/files/54c48d40-bfdd-4e61-9871-527f8d78fe1d/easy_way_to_make_homemade_wine_from_grapes.pdf
    • https://uploads.strikinglycdn.com/files/d4eecdd1-399e-4475-8076-03aa80add46a/tepizogunoxegefinepomu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29f.bin
2db63549eced4cc165a436f7a85bb8c9fc6515d603400a0607dda0172d1dab72
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 5548 bytes
font_01_sfnt_off0000f570.bin
e37efd802442d27070481b5ddcfcc1c8eee5798bed3886ffcba9aa127441a045
pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10504 bytes