Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3af48a8775d8a…

MALICIOUS

PDF

75.9 KB Created: 2021-05-22 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a3b45b1f9645f4d5c5558080736b58 SHA-1: 78fa4c136caee9358bfb2d20c655e3a7785ddbd8 SHA-256: 23f3af48a8775d8a6410c77c879f9c8e49dfd1e7216aa83f4f15c56a0d2b9f70
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many of which point to PDF files hosted on link farm domains, suggesting a phishing or malware distribution campaign. The document body, though partially corrupted, indicates a lure related to 'Pirates of the caribbean cello quartet sheet music'. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=pirates+of+the+caribbean+cello+quartet+sheet+music
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/fibib.pdf
    • https://damuduwanilew.weebly.com/uploads/1/3/4/4/134477354/vovaj.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/01d2abd4a6ae9f.pdf
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/20529.pdf
    • https://pagevexositikul.weebly.com/uploads/1/3/5/3/135327712/tosop_gipifagep_pulajigatiwori_zuburuvu.pdf
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/zotex_dezixor_penininalil.pdf
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/tetelevolajozij_jobunadifimuvep.pdf
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/ae66a43c2ce15.pdf
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/wopoto.pdf
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/buxalawo-ganewer-xoxuzemuw-pepufeleroboj.pdf
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/0101d.pdf
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/tiwegawinipe.pdf
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/voxiluwosowi_tozup_xizexewage_junarup.pdf
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/9726801.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cec2c36f-dbc8-410f-9d86-bae1351b82fe/depivepikitilusozev.pdf
    • https://uploads.strikinglycdn.com/files/e4e6eb6f-6cc9-4575-889d-5442f8110424/is_the_hp_officejet_4500_wireless.pdf
    • https://uploads.strikinglycdn.com/files/49d399b7-94ef-4576-931f-9d43bc6bd276/sharp_objects_season_2_trailer.pdf
    • https://s3.amazonaws.com/foneniz/dell_u2415_no_dp_cable_hdmi.pdf
    • https://s3.amazonaws.com/ratixifo/informacion_general_de_los_arcaicos.pdf
    • https://uploads.strikinglycdn.com/files/e2a53d83-b4a0-464a-ac83-e804e87d9de6/qsc_gx5_amplifier_specs.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_off0000e9f0.bin
71b6a0d0dca86c55a132639e9a94d5b4815aaa3af8455bf5b4f654746991f6c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 5388 bytes
font_01_sfnt_off0000fc1e.bin
3bd2325d36d79aa1ed8e28b29469063e441800bad2459bbf229b385593c946f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10408 bytes

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