Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d7fc4b04f89d02…

MALICIOUS

PDF

68.7 KB Created: 2021-04-27 23:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24813a92367ef9657cbf2990a4d473a SHA-1: 6a68760a841cfe8ea7996156db400e996e2415c5 SHA-256: 48d7fc4b04f89d02bc437b2e32098c9c2c6add1f2b52aae79fc142845e0a821c
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=barron%2527s+sat+subject+test+biology+e%252Fm+pdf
    • http://robolab.one/amberley_district_state_school_uniformy4a4m.pdf
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ff29674c4c31.pdf
    • http://glossywp.online/free_download_of_schubert_ave_mariaypzgz.pdf
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fcd5d789646c.pdf
    • http://nukicew.xyz/norse_mythology_creatures_giantsqel2y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalisujezajaje/diono_radian_3r_booster_installation.pdf
    • https://s3.amazonaws.com/mikibetiv/is_singapore_safe_at_night.pdf
    • http://jotunoxageleza.rf.gd/parabitebus.pdf
    • https://s3.amazonaws.com/bogijexu/fitaravapazokukuvexupon.pdf
    • https://s3.amazonaws.com/sobaketemu/bink_s_sake_piano_sheet_music.pdf
    • http://wasofiwomorap.epizy.com/calligraphy_cursive.pdf
    • http://wojefuk.rf.gd/calcutta_university_phd_application_form_2019.pdf
    • http://sorofakomefus.epizy.com/cat_6_cable_colour_code.pdf
    • https://s3.amazonaws.com/tugafebip/72979508334.pdf
    • http://bubomikofar.epizy.com/hackerrank_questions_and_answers.pdf
    • https://s3.amazonaws.com/julexekubaj/95325569721.pdf
    • https://s3.amazonaws.com/tutapaxi/tupavumiguxefabaj.pdf
    • https://s3.amazonaws.com/fojaxexino/distance_of_hurdles.pdf
    • https://s3.amazonaws.com/garorowa/node_js_axios_post_formdata.pdf
    • https://s3.amazonaws.com/rutufokedizon/introductory_econometrics_a_modern_approach_5th_edition_citation.pdf
    • https://s3.amazonaws.com/lekezaru/how_to_connect_spectrum_remote_to_samsung_soundbar.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_off0000ceec.bin
4bd9315c23b698980b0965142c05fae143e49d02ef973087222f1a95419e8faa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 5912 bytes
font_01_sfnt_off0000e315.bin
eaf4f762aaf5e7a8850e8a25874fafc2cd12d0e7dbf5ae58f0dfd0977a673186
pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10028 bytes