Malicious PDF — malware analysis report

Static analysis result for SHA-256 58230a6713f25be7…

MALICIOUS

PDF

76.4 KB Created: 2021-02-27 15:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f2733e6c8634b45282933456a5fb528 SHA-1: 2e1b0eed3873052cbbd0548d56579e9e7dd591c7 SHA-256: 58230a6713f25be798a714403178c6a55d1cbacfe88205f0d88eff1621f1dac6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of 30 external PDF links. The primary URL, https://jottigo.ru/123, is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=is+my+passport+ultra+compatible+with+mac PDF link annotation
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/fd3f1.pdfIn PDF document text
    • https://jawimuxuketeg.weebly.com/uploads/1/3/4/7/134763527/riviziniguram.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/hdlggjh/atlantic_fleet_commander_ww2.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/idKSibJ/swtor_jedi_knight_solo_build.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380680/normal_5fe1f7bfa8ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ojahdhb/transmission_fluid_flush_how_often.pdfIn PDF document text
    • http://finansi-7.online/therese_raquin_broadway2hfab.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/eA5nWhb/nozunedarikixezeveg.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ihicqgj/mukoguwatavegas.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/hjhjfOB/modesto_weather_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_6036c5343d39b.pdfIn PDF document text
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/e98f3a914a.pdfIn PDF document text
    • http://purpless.vip/how_to_code_a_game_for_beginners_freeu5wf9.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/bepukuba/xivarijavu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/bittorrent_websites_to_from.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/simbolos_diagrama_de_flujo_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/tidexozipema.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/tosoxakakejapibusuni.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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 5444 bytes
SHA-256: 0b4b96589e735547a5b023884f2ea267e39fe1d8562ae03bb2993065f0f1720b
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 10548 bytes
SHA-256: 88c0f4649d47c8209fec313a44431e7a12efba7b342e3bbf7685d1ead3a371af

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