Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7ff4e104bf6742…

MALICIOUS

PDF

64.8 KB Created: 2021-01-19 00:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 511540c133c1aa21ae4f50f02ad67189 SHA-1: 8d55047be36af946e1fcefaf297ddac13d77ee78 SHA-256: bd7ff4e104bf67429d2fe89408d48cc5a2cfff8821252250bb15cd4d558246e8
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malicious content delivery attempt. The PDF structure and embedded content indicate it's designed to exploit users by directing them to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=the+notebook+online+ru PDF link annotation
    • https://site-1254282.mozfiles.com/files/1254282/67954034835.pdfIn PDF document text
    • https://site-1177660.mozfiles.com/files/1177660/xaxarimepuwajiwipup.pdfIn PDF document text
    • https://site-1227608.mozfiles.com/files/1227608/pulodunapavepubiremog.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hcghONs/vr_space_simulator_2020.pdfIn PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/graphing_slope_intercept_form_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/0ijc3jb/rumexosibibizapoweweza.pdfIn PDF document text
    • https://site-1166610.mozfiles.com/files/1166610/56594854745.pdfIn PDF document text
    • https://site-1174586.mozfiles.com/files/1174586/likes_followers_on_instagram_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisoramemib.rf.gd/tubutefozakex.pdfIn PDF document text
    • http://nepunefetonub.epizy.com/76502050567.pdfIn PDF document text
    • http://rupeguv.epizy.com/google_sheets_fit_column_width.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/68610072782.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/letter_of_recommendation_for_student_scholarship_template.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/drakor_love_alarm_sub_indo_batch.pdfIn PDF document text
    • http://tojegazanet.rf.gd/kabhi_alvida_naa_kehna_song_free.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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 4536 bytes
SHA-256: 4db21893cb15647d4a38e61ebb6b9a2c6ce99214116e55a0a8687a5a3d0e417e
font_01_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 10184 bytes
SHA-256: 867e145d2ce976ab108c43b67fb7c7968141338e363428a7a13b54f06523e533

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