Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d3281ba2afbec7…

MALICIOUS

PDF

76.5 KB Created: 2021-04-18 13:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15843b1e3c10e1e27981d39f754cc5cd SHA-1: bb7165d67b451caa2f68d65a092a7b7b984bc591 SHA-256: 66d3281ba2afbec7aa23cbb9570d4067ac0e117671a919dd9a037c76c55c1539
104 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'dafemum.ru' suggests a phishing or malware distribution attempt. Although no scripts were extracted, the document body contains text that, combined with the heuristic 'SE_URGENCY_LURE', implies a social engineering tactic to prompt user interaction with the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=parents+as+partners+in+early+childhood+education
    • https://cdn.sqhk.co/tamoravuwera/djfihm3/what_is_included_in_sling_blue_sports_extra.pdf
    • https://cdn-cms.f-static.net/uploads/4388169/normal_603450e718ee5.pdf
    • https://cdn-cms.f-static.net/uploads/4450350/normal_606aa42dbeb4a.pdf
    • https://cdn.sqhk.co/xubupigegi/fgfgh4t/tosisatonagesexiwidobedi.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_6051ff635de3b.pdf
    • http://lexulepi.22web.org/teenage_romantic_books.pdf
    • http://barberking.best/shawn_and_camila_senorita_performancefzdvd.pdf
    • http://eslivdrug.space/what_size_file_for_poulan_18_chainsawgqfzo.pdf
    • http://store50off.info/linen_sheet_set_kmart1c4bj.pdf
    • https://cdn-cms.f-static.net/uploads/4498801/normal_605efe7bd9388.pdf
    • http://leftoutclub.com/dish_end_calculation784zi.pdf
    • http://gefaveje.22web.org/zigokobagonolivutamewamop.pdf
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd1d115c42fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rejaromavovelu.rf.gd/pan_africanism_conferences.pdf
    • https://s3.amazonaws.com/rebesudanolo/how_do_i_fix_my_hp_printer_that_is_offline.pdf
    • http://leduvusiluvev.rf.gd/49357793430.pdf
    • https://s3.amazonaws.com/legesiliv/48310837559.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28c.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 2900 bytes
font_01_sfnt_off0000eccf.bin
1aee6c163e62a2bebdbd538804fd22724943ea2626e41db2857bad1bc8302b64
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 5264 bytes
font_02_sfnt_off0000feb2.bin
a31ce065d4551183b99b1ea94a79b0bdd29482744651b94b8a68e76d3d295707
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 11076 bytes