Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af1eb5d4b8d56c…

MALICIOUS

PDF

80.8 KB Created: 2021-05-01 18:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c15b5f1a28a8911e4b64d68b136bc74 SHA-1: 197e93aa6e1dbdcbbea548908e3758c5b07625c0 SHA-256: 77af1eb5d4b8d56ca3171165110a7164add355b21e258c69ff02cc0a11644cd3
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that directs users to a website related to 'conflict in nursing management', likely a lure to disguise a phishing or malware distribution attempt. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=what+is+conflict+in+nursing+management
    • https://cdn-cms.f-static.net/uploads/4464311/normal_6013af210591a.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_60241fea75384.pdf
    • http://jekebes.iblogger.org/samsung_dishwasher_installation_brackets.pdf
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_6046f81241ff9.pdf
    • http://nopezimugabotik.mygamesonline.org/tubiku.pdf
    • https://cdn.sqhk.co/kifateten/fcge8ij/xoviz.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6050f5f93b71b.pdf
    • https://cdn-cms.f-static.net/uploads/4443619/normal_603f43bd0b2d4.pdf
    • https://cdn-cms.f-static.net/uploads/4458616/normal_603fbad61c0c3.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601e085eba0f1.pdf
    • https://cdn-cms.f-static.net/uploads/4464330/normal_60586308647e1.pdf
    • https://cdn.sqhk.co/netesatova/4PiehzL/funny_baby_stickers_for_whatsapp.pdf
    • http://nekuwagibajese.getenjoyment.net/75969721371.pdf
    • https://cdn-cms.f-static.net/uploads/4388424/normal_602051ce48832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nedizilunok.myartsonline.com/nijode.pdf
    • http://xodibux.rf.gd/battery_tender_waterproof_800_ma_12_volt.pdf
    • https://s3.amazonaws.com/tutapaxi/51673675479.pdf
    • https://s3.amazonaws.com/kisagoz/how_to_remove_suzuki_intruder_1400_seat.pdf
    • http://kejefutipetube.epizy.com/recognition_employee_performance.pdf
    • https://s3.amazonaws.com/runuzitexokol/59105140083.pdf
    • http://figupowogo.rf.gd/cakephp_form_helper_label.pdf
    • http://duxurajixi.rf.gd/66794279939.pdf
    • https://s3.amazonaws.com/buwosevax/love_live_stickers_guide.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_off0001009b.bin
7386f2505975e094ef229af572acd869a9c58412864ac83891018b3e6ab5fe51
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 5308 bytes
font_01_sfnt_off0001128c.bin
40a9ca5cb7baf0ade61bfec744ceab52e57e8049219bada118fdf91f29b67369
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 10152 bytes