Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b21c6b7797099a…

MALICIOUS

PDF

72.4 KB Created: 2021-04-05 20:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100a0212dba2ec6035c1733f2c311cda SHA-1: 54787c604128e1a8af6cad7a6374d2757587cb0f SHA-256: 51b21c6b7797099a5fcd8a6d39124e3d6c74838f0d9b498b533cd132e4e58952
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is `https://maypoin.ru/award?keyword=jump+math+grade+3+worksheets+pdf`, suggesting a lure to download further malicious content disguised as educational materials. No scripts were extracted, but the presence of multiple external URIs indicates a likely 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://maypoin.ru/award?keyword=jump+math+grade+3+worksheets+pdf
    • http://kejurudoji.medianewsonline.com/accelerated_c_koenig_moo.pdf
    • https://cdn.sqhk.co/pedidagow/cwicfjd/91052329717.pdf
    • https://cdn.sqhk.co/fibafape/4toiagh/musilumetinipifixozadagev.pdf
    • http://pegejoruvufiron.sportsontheweb.net/english_grammar_exercise_tenses_multiple_choice.pdf
    • http://gawuguvososu.iblogger.org/97970208109.pdf
    • https://cdn.sqhk.co/pemiduwegam/id8Khhc/candy_cane_lane_movie_2020_manotick.pdf
    • http://kemedejovon.getenjoyment.net/biology_project_on_human_heart.pdf
    • http://dakisemakegag.sportsontheweb.net/24250113662.pdf
    • http://suvolupijiro.mygamesonline.org/63481758051.pdf
    • http://wofurasosezisax.mywebcommunity.org/38308409264.pdf
    • https://cdn.sqhk.co/lewulula/VuifjbY/46087691090.pdf
    • https://cdn.sqhk.co/bokupajokim/iehhGun/nuvezakejup.pdf
    • https://cdn.sqhk.co/vixawutozama/jdD3sjd/werepiruxafekelu.pdf
    • http://piludid.22web.org/77422501640.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://koxolavomuzo.myartsonline.com/12882642576.pdf
    • https://uploads.strikinglycdn.com/files/8757144e-86bb-4fcc-a365-23774fcd91fb/gonifokasegixuvimaxajet.pdf
    • http://femixuduj.rf.gd/duraxusebuzeripipaxida.pdf
    • http://fuzezufomazo.rf.gd/wopuwizivibufuzev.pdf
    • http://zonafikepejese.onlinewebshop.net/zuxefitefomunibel.pdf
    • http://bokawevetejap.atwebpages.com/56546223652.pdf
    • https://uploads.strikinglycdn.com/files/11524537-f2c0-47b3-b8a2-166b1630b852/zusosemuwefekitebivunef.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_off0000d9d1.bin
98206c1e7505b2233792add3fad3733924570cde7353aa0d6df88b696da0606f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5732 bytes
font_01_sfnt_off0000ed43.bin
4dcf80ec8797ba47b68ea5b9fa3779af06a12dd12e8a2e20957cd3d44028c52f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 11416 bytes