Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b770891731ccdfe…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 05:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da295a9373b31ef0678b4d055d74db5f SHA-1: e438392471a596109a20bda36880d07e171ce8c6 SHA-256: 5b770891731ccdfe17c3508d1d1231de8dab6de67cf9420651124a41f99399b6
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, with a high risk score. It contains multiple embedded URLs, one of which is directly referenced in the PDF metadata, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to an academic exercise, further supporting a social engineering attack vector.

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://resalured.ru/award?keyword=past+simple+regular+and+irregular+verbs+exercise+pdf
    • http://onlinekartiadesi.com/7952314755n2jve.pdf
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/16f25ddcfa04ab.pdf
    • http://lifolibi.sportsontheweb.net/fefeze.pdf
    • https://cdn.sqhk.co/nejibija/igcgjic/34839677810.pdf
    • http://astrology-personal.online/18995797005braec.pdf
    • https://cdn.sqhk.co/sewuvavimebi/icjc5eV/who_won_the_civil_war_in_russia.pdf
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/mifetoz.pdf
    • http://zumewidife.mygamesonline.org/wills_eye_hospital_medical_records.pdf
    • https://cdn.sqhk.co/keragipiki/ecj3gfI/brc_v8_audit_report.pdf
    • http://bestrongbyg.com/how_to_create_a_character_model_in_blenderyvee4.pdf
    • https://cdn.sqhk.co/pawekenu/armm5RH/can_herobrine_kill_you.pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/vamukofomejuxe.pdf
    • http://hook-up.fun/circle_flow_chart_template_wordtexaq.pdf
    • http://moradudipomibo.mypressonline.com/pomizopuferiboxuzezaga.pdf
    • https://cdn.sqhk.co/sojuzafu/yRhcSjh/minecraft_story_mode_switch_review.pdf
    • http://8bitbeardsco.com/precalculus_with_limits_5th_edition3jvjd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xevijojikutep.onlinewebshop.net/amor_a_dois_andrei_moreira.pdf
    • http://saluwagasa.onlinewebshop.net/triumph_bonneville_service_cost_india.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3f.bin
516c949e1a177af099524ef9d94087e2d1a119c56693266efd49dbb4c78b98f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5744 bytes
font_01_sfnt_off0000ffc5.bin
94d81df1cccd5504b8966ac57524b006b447490a978030c1e341b9855648a39f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 10564 bytes
font_02_sfnt_off000123f2.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 16096 bytes