Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd5847bb954d865…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 02:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d76b3debef7c75cce7fe62ba8e743c43 SHA-1: 93a4133844f7ad296cb001758ee6c8a3103b421a SHA-256: 9cd5847bb954d865b98ff4c7f7787054f405ed6eb57ee334a20010f50260d196
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=fur+elise+trumpet+sheet+music+easy PDF link annotation
    • https://bipusisep.weebly.com/uploads/1/3/0/7/130775903/zojefegukoxifes.pdfIn PDF document text
    • https://bizokotipalan.weebly.com/uploads/1/3/4/7/134771030/turozo_raxuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_604f9203e5098.pdfIn PDF document text
    • https://kalanuwil.weebly.com/uploads/1/3/4/6/134634674/memawelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_60270dc99124e.pdfIn PDF document text
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/6262294.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/kapop_pebegeji.pdfIn PDF document text
    • https://bemawupi.weebly.com/uploads/1/3/0/7/130740003/fuzubigifusikax_paravo_ranezozuxuz.pdfIn PDF document text
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/e2448dbefcf5b83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144428139/javiwom.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/how_to_get_my_w2_from_my_last_job.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/need_for_speed_payback_ps4_mod_menu.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144432132/dawuporesawadaromeleka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce907a08-a28a-4d6f-a35a-714f4c41a156/xibitujevewafuzojar.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413715/66302139558.pdfIn PDF document text
    • http://veweran.pbworks.com/f/55197581970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb6b5fa-a13f-45a0-8de9-df900f811e4f/word_to_describe_touchy_feely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843cf11b-6c78-4aee-b6c1-c83b3538ecb2/mr_coffee_iced_tea_maker_tm30p_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85faf006-c6dd-4dac-9889-470c32139cfc/how_many_floor_trusses_do_i_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a10905-9524-4a09-9491-cd564f1d648c/titulo_de_credito_hipotecario_negociable_peru.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144432960/34113922001.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/38764416860.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 5228 bytes
SHA-256: ebbdc756efe86776adff300d8fc3a6714ea004441d797d252b4b0ecd282b0c47
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 10640 bytes
SHA-256: 3e2cf17d4e6589443fced3a4ddd56c782eea29fe8da4408e8e334c1c436cad96