Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1e7a94f64fdc81…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 04:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 758b3cb9411b02aaaaa94dd9ab2e74ee SHA-1: 722baa908053e49733a053deb34aa923285573d3 SHA-256: 2f1e7a94f64fdc811d330cf224e6949f642681caf6045c68c457f5c7d4e625a5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure for a free download, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/123?utm_term=hangout+for+desktop+pc+free
    • https://cdn-cms.f-static.net/uploads/4471092/normal_60589e3a99de3.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5fe99e46daab1.pdf
    • http://wizagulonas.22web.org/70235843487.pdf
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6042fb5f4c154.pdf
    • https://cdn-cms.f-static.net/uploads/4426966/normal_602f7cfbb5b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4486742/normal_603150bab38b9.pdf
    • https://cdn-cms.f-static.net/uploads/4405660/normal_5fda5a5ae38c6.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6055189237559.pdf
    • https://cdn-cms.f-static.net/uploads/4463034/normal_600ab2e1f347d.pdf
    • https://cdn-cms.f-static.net/uploads/4464319/normal_602ab64e8d628.pdf
    • http://biweten.22web.org/architectural_drafting_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02b1abb5-28b9-4de7-88fd-0d8ce956ceef/kefomubanafiz.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/e257fbbb-ea2c-4a3f-a188-bd17d8010f4e/86250704066.pdf
    • https://uploads.strikinglycdn.com/files/201d943b-1ee2-4d30-9887-ff17154d5df7/what_is_the_violin_song_in_queen_of_the_damned.pdf
    • http://pijularof.epizy.com/how_to_use_elite_platinum_air_fryer.pdf
    • https://uploads.strikinglycdn.com/files/a374fd23-d7ab-459b-a8f4-048a61086da8/38390388007.pdf
    • https://uploads.strikinglycdn.com/files/4c7f3f63-6891-4f71-ad0e-d678bb6b736c/why_do_i_keep_waking_up_from_dreams.pdf
    • https://uploads.strikinglycdn.com/files/508eb52d-8e9d-46c2-84ec-449dfe4ea9d2/windows_rotate_display_hotkey.pdf
    • https://uploads.strikinglycdn.com/files/76cabbbc-e6e2-4ab3-a9a0-28ecc6acec76/chemistry_a2_data_booklet_edexcel.pdf
    • https://uploads.strikinglycdn.com/files/af03b768-e383-4a0e-80c0-2eac679de0b9/37005941851.pdf
    • http://wanudoxemix.epizy.com/cheesecake_factory_menu_prices_2020.pdf
    • https://uploads.strikinglycdn.com/files/89335d21-eb4d-46a8-af4f-976390d239a7/7075574502.pdf
    • http://zakivijojinikij.epizy.com/46111880158.pdf
    • https://uploads.strikinglycdn.com/files/01221ef3-8ff6-476d-9933-f386ee906159/17134486709.pdf
    • https://uploads.strikinglycdn.com/files/e92a9c68-2e4d-4153-a92b-85037cf3d9a8/97954662461.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_off0000fbeb.bin
17f58ea7b801334d07bbbc276fff42e5b92fda4066c20950d37e01b84cd87344
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 5316 bytes
font_01_sfnt_off00010e1a.bin
7fc7a1c9815af92ca5ee97788f69a510a7dd62f40617ecb73b8525411c675bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 10716 bytes