Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3db666cc14b1856…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 15:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 018e8835638360f6698a06bf4215c302 SHA-1: 5a13cd32b266031efbef62d0df558716c6cb9377 SHA-256: b3db666cc14b185624ab652591dfbcd34db917c7720159dadb2e02c544c461e6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('baarspo.ru' and 'profaudit32.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wb?keyword=king%20lear%20characters%20slideshare PDF link annotation
    • http://profaudit32.ru/know_thyselfl7j5i.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/LeCgfAQ/fituxit.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/what_is_biblical_comfort.pdfIn PDF document text
    • http://varietystore.website/rush_2049_arcade_cheatsioj1x.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/8567872.pdfIn PDF document text
    • http://trokot-newshop.online/how_to_pair_selfie_stick_remote355e2.pdfIn PDF document text
    • http://pivowave.iblogger.org/baofeng_uv_5r_plus_manual.pdfIn PDF document text
    • http://persequen.com/samsung_rugby_4_battery_liferz87r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/60442137831.pdfIn PDF document text
    • http://vuxubeso.rf.gd/67740258657.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/sewafomejowa.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kerbal_space_program_control_surfaces_inverted.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/common_laboratory_equipment.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/direct_support_professional_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://bedegexemizi.epizy.com/bullet_raja_movie_dialogue.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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 5172 bytes
SHA-256: 0f48ad58b04b836f409b2d820c1d14bde5539e94acb448c70fe89be501a35313
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10420 bytes
SHA-256: 70ebec4c6d7a9e46bcf4cadf4e40c5fc4c371a96380d7d0251c51ddb7f51a2a7

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