Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea237f4f864260a2…

MALICIOUS

PDF

75.5 KB Created: 2021-02-16 11:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f60b73a7edce166261939e128b5c2124 SHA-1: cb1027a0c1f655b25c82530a9d23002261f162d3 SHA-256: ea237f4f864260a237a6ad86438570ca6220033e89b5d919c38018b0e4211179
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including a suspicious URL on 'baarspo.ru'. The presence of a large number of external links and the use of disposable hosting suggest a phishing or spamming campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or SEO manipulation for malicious purposes.

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://baarspo.ru/strik?utm_term=can+you+put+vicks+vaporub+in+oil+diffuser PDF link annotation
    • https://cdn.sqhk.co/jofijoju/YDdOljf/dog_rescue_adoption_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5fcae1db39723.pdfIn PDF document text
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/palametimesojubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_6015e2c73e058.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/defagokogose_vumazenum_vikosogaja.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/numaxekujigiref.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/VIifBii/68288330097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489583/normal_5fe1c10b9c9ef.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/ijfgihf/dragon_ball_z_evolution_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/xfidhb9/85102765974.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/wTgcEmc/starbucks_secret_menu_2020_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/RKggYhh/call_of_duty_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/fOhhnjf/45524883460.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/IvbljfA/fefanisimatiki.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/zimefazipizepigefek.pdfIn PDF document text
    • https://tazififodokufu.weebly.com/uploads/1/3/0/7/130776891/6324626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/cpr_erc_guidelines_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/brass_band_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/23333787394.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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5420 bytes
SHA-256: ad38974642ab94fb9fe1ca399c277e04be2113c6344f3c92df35e565f1412c30
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10920 bytes
SHA-256: 472af84f0085007fd44115ab7ac73368510664c128e625b336fe90d7b9b39778

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