Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b609b926934402…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ffc4a5305e40d4a0598ca3e89ebabc03 SHA-1: bd87580fdf17f9d100d801b977010dbc75d0513f SHA-256: 18b609b9269344020d7788cd95f6f2ef481047b21cf99c1c43deb2a901f55e13
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the link-farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/123?utm_term=chirutha+audio+songs+ing+com PDF link annotation
    • https://cdn.sqhk.co/juzivadareka/iaIfiyx/mepadumob.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/1317908.pdfIn PDF document text
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/8716d.pdfIn PDF document text
    • http://emmetrix.net/graco_pack_and_play_sheet_set0p8tg.pdfIn PDF document text
    • http://kuvijuwe.22web.org/although_vs_despite.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/rizuw.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/iclcOhe/sharper_image_camera_binoculars_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jdhbtCz/bezivowijodomob.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/g4hdjic/download_game_virtual_table_tennis.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/iiiJJUe/90481306162.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/2gdKNia/can_heroes_act_pass_senate.pdfIn PDF document text
    • http://khareedforosh.com/diary_2019_template_malaysiae1wml.pdfIn PDF document text
    • http://aycotoro5.xyz/84754386667l9smp.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/cGBaZvT/black_desert_online_lucky_tools.pdfIn PDF document text
    • http://logvoz.ru/lisemebonisejinirovupt6hru.pdfIn PDF document text
    • http://fukefaz.22web.org/bafafugokop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalesas.rf.gd/94828808025.pdfIn PDF document text
    • http://jutikekenagej.epizy.com/bolukevavaxovunoralixu.pdfIn PDF document text
    • http://losoxapo.epizy.com/99188547151.pdfIn PDF document text
    • http://xojonujemamaro.epizy.com/how_does_a_fuel_injector_engine_work.pdfIn PDF document text
    • http://nodonukebonona.epizy.com/the_uglies_series_movie.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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5224 bytes
SHA-256: 4b36653851b593c60d761c2bde769faea4613b38c6f1a7d9ef9b78a11023bb04
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10964 bytes
SHA-256: b01bac606a2c20453b404f70ab482bb5ccdf3ab0f64826caad0970e85a8a7b7c

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