Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4a497cb630837…

MALICIOUS

PDF

79.5 KB Created: 2021-04-03 00:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a45845d79a58a998a92d88fc7d363c SHA-1: 7b5c75ad8e6d5358122344942499bf3203942bbd SHA-256: 9cd4a497cb6308376cdb2c13245cd620be65dd0a15414ef9f847122c8ab3f73a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=why+do+new+strings+sound+bad'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=why+do+new+strings+sound+bad
    • https://cdn.sqhk.co/xawobovuji/8Ughjai/felmo_pay_app.pdf
    • https://cdn-cms.f-static.net/uploads/4368731/normal_604b9c3068e00.pdf
    • https://cdn-cms.f-static.net/uploads/4450337/normal_60367d3b2aec0.pdf
    • http://lexaliki.22web.org/sipud.pdf
    • https://cdn-cms.f-static.net/uploads/4373522/normal_60616ab428cac.pdf
    • http://dojisef.iblogger.org/rabinewuzefixa.pdf
    • https://cdn.sqhk.co/xororofomed/fjajbha/scary_horror_escape_room_walkthrough.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600fb67ae9d89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19bc62eb-3f45-47f6-bc53-7234cd970098/94734129789.pdf
    • http://parezorizujax.rf.gd/pifimaru.pdf
    • https://uploads.strikinglycdn.com/files/6e81b16d-c004-4abc-bff6-c3663703ec2d/what_do_we_mean_by_bill_of_exchange.pdf
    • https://uploads.strikinglycdn.com/files/829a2139-8aee-4d8c-9ed5-5e810bfa7ad9/how_to_replace_beats_solo_wireless_ear_cushion.pdf
    • http://risumipekalur.rf.gd/29777582059.pdf
    • https://uploads.strikinglycdn.com/files/96538a0c-d7cd-4923-addc-20b96cf29941/a_supposedly_fun_thing_ill_never_do_again_audio.pdf
    • https://uploads.strikinglycdn.com/files/43c19f53-6a4e-42ae-9934-1908182b99c3/41647414394.pdf
    • https://uploads.strikinglycdn.com/files/3decc095-d3bf-4e53-8c67-073ae614f235/allen_carr_easy_way_to_stop_smoking_free_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/a3fa02a0-7dec-4064-b25e-cc630da7a219/how_to_draw_fancy_alphabet_letters.pdf
    • https://uploads.strikinglycdn.com/files/d8bda493-d3d8-4dab-a9c1-f4782ad6c050/41739469908.pdf
    • https://uploads.strikinglycdn.com/files/8368a183-a279-4488-943c-a7910e48cfec/celestron_astromaster_70eq_review.pdf
    • https://uploads.strikinglycdn.com/files/8e53ffbd-e2e0-4014-8f20-b3d40e83b8e9/active_and_passive_voice_worksheets_for_8th_grade_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/fedc8058-f115-46fe-a08e-f83b9613e9f7/tony_clink_the_layguide.pdf
    • http://fakodesugi.epizy.com/tahoe_boat_trailer_owners_manual.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_off0000fc7f.bin
c34c6f53173fe1cdd7e61bf6724223d2116cc4c659bed9636e609d10de11450a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 5400 bytes
font_01_sfnt_off00010ef4.bin
0d6affb9ea841c1851947aa5fc0b646b4f2cb53a7f21e6bb500816ac040f52d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 9972 bytes

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