Malicious PDF — malware analysis report

Static analysis result for SHA-256 1438729b84bdeffd…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 17:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d5e3ff8992574f3e4c101086957420d6 SHA-1: 60e0207077d56512032f29cc1e5ff89dd3547450 SHA-256: 1438729b84bdeffdaaca77a10c8c8ba011addc88e10330b849cbae28f5d2d101
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://crophysi.ru/strik?utm_term=how+to+pair+microsoft+bluetooth+mouse+3600 PDF link annotation
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/zofuzonavoza-nadoxujazeguful-lijawewodutiz-razuzakojigi.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jeighep/64488461201.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aFLQdim/lonergan_v_scolnick_issue.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/hfAw3ec/42282149526.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/waraxowapiz_zijaxigim.pdfIn PDF document text
    • http://migriruy.ru/11304655002nmoe4.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/mamibis/question_answer_of_chapter_mijbil_the_otter.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/offline_trading_card_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/josowipivegabizi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/chest_x-_ray_powerpoint_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/44832540581.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/jedarutenusigineza.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/best_background_images_hd_for_picsart.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/wow_balance_druid_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/quantifiers_exercises_with_answers.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 5908 bytes
SHA-256: ba0f78794ea3732ac60c109f3ff638cb441d3bb63cbc723fb048f285561856e9
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10528 bytes
SHA-256: 4f6ed569775a0963483ccd2a3d30aed244a14d3f33436d1143d8f76845fc29b0

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