Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f75f1091dd0a6…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 13:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e03f8f342d84ce0be5b9ff08ac2ec7af SHA-1: e7826e4f6abb3241ed8b24059ca51cf9e5e14dd3 SHA-256: c25f75f1091dd0a65fd41cf326701972249facfe2725744e8f072d3785e473ec
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of numerous external URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/award?keyword=atrybuty+%25C5%259Bwi%25C4%2599tych+pdf PDF link annotation
    • https://cdn.sqhk.co/fonazovep/06Xhch5/green_papaya_salad_recipe_vietnamese.pdfIn PDF document text
    • http://foodguideblog.com/rukudi7a4jw.pdfIn PDF document text
    • http://jusapp.club/86579533025zcz8h.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/cj2ieha/2017_football_playoff_bracket.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/pinisidozuzimuxofo.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/bWQGYhd/vawufajew.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/iiNifjb/muvomexa.pdfIn PDF document text
    • http://gejekixevase.22web.org/wotutavupaxas.pdfIn PDF document text
    • http://lg-copyright.com/pimobgqjak.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/bagugeweniwa.pdfIn PDF document text
    • http://potenciy.xyz/dodominevujiunmro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubadix.epizy.com/rics_complaints_handling_procedure_help_sheet.pdfIn PDF document text
    • http://tukutuxobolekub.epizy.com/bully_pc_fraco.pdfIn PDF document text
    • http://wubezitapafa.epizy.com/how_to_read_the_dark_tower_series.pdfIn PDF document text
    • http://pakatikik.epizy.com/11871495682.pdfIn PDF document text
    • http://wiferowifi.rf.gd/rawudilanitugumuzowali.pdfIn PDF document text
    • http://webubop.rf.gd/87881740793.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5528 bytes
SHA-256: 14153294ee62cc1197488e0ef7541f81e100a51386fe8a7e2c37d46ebf213763
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 12384 bytes
SHA-256: 2c17d4bddd11c613f625e7d1eccf6b6908d80bd75f4dd28f81da86f761ace6bc

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