Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3ded3a764a3ecb…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 17:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be2bd9a5219ecd63cdab161691ee7075 SHA-1: 77ca20f042ec3a20a4d88584f83a3765ad282834 SHA-256: ef3ded3a764a3ecb3615245df0cb3b067a229e60b3507ac67edb45df5489a508
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, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to Google Classroom quiz answers. The embedded URL `https://ponafet.ru/strik?utm_term=how+to+see+quiz+answers+on+google+classroom` likely leads to a malicious site or download. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing attack.

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://ponafet.ru/strik?utm_term=how+to+see+quiz+answers+on+google+classroom
    • https://cdn-cms.f-static.net/uploads/4495858/normal_602c8abcc1156.pdf
    • http://ourfanz.com/disotecndsm.pdf
    • https://cdn.sqhk.co/gefewivurov/r2higgS/dragon_hunters_movie_watch_online.pdf
    • http://buybritishcat.com/what_does_1024x768_resolution_mean3lr1n.pdf
    • https://cdn.sqhk.co/fabukujeb/cnghMk4/satomasuvaralujiwitevo.pdf
    • http://haustova.com/area_and_perimeter_anchor_chartuopc9.pdf
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6022991977a7a.pdf
    • https://static.s123-cdn-static.com/uploads/4415930/normal_5fc736d595ea7.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601e8f580ad97.pdf
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fe40957bb531.pdf
    • https://cdn.sqhk.co/rekutadis/tji5UyA/front_runner_outfitters_free_shipping.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_13bd55471a0143288cdc50206b00b10f.pdf?index=true
    • https://s3.amazonaws.com/mivokozibu/gufaxekelakomeguba.pdf
    • https://s3.amazonaws.com/tajimipojimo/22033202082.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_c676bad3112447c1a0ffd5c5223bdfdd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0eab92a4-9552-430f-8f2a-8313804b2614/somewhere_over_the_rainbow_uke_chords_and_strumming_pattern.pdf
    • https://s3.amazonaws.com/jijumupade/free_admin_panel_website_templates.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_a74a1f47b5794c63a6ec8e32ffac9df4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dbbe4161-dd20-4000-8670-6793c3cc22a7/wajowemujasefonuk.pdf
    • https://s3.amazonaws.com/jinotugiwomo/goseparasokutul.pdf
    • https://0c8c362d-a371-4808-bd54-be8feebb0ce1.filesusr.com/ugd/0182ef_b032fca15e9f4c3aa14ea1d4ee12c203.pdf?index=true
    • 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_off0000e6dc.bin
a463b03105651c5a3549435418926b615218e25f102fadb9d4b0349d1591fdc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5348 bytes
font_01_sfnt_off0000f912.bin
3541ed218210f06802e76ac2543708aca6272671cd35e43a92d7098777a24ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10912 bytes

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