Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb4f9307197ca0…

MALICIOUS

PDF

81.8 KB Created: 2021-02-12 09:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6a44abb770e52a370b50f9e99592c78 SHA-1: de20dfa3e618b733f35cc8534e64fc9fe4b5bdd7 SHA-256: 87fb4f9307197ca06730a36b8be587986817ab91c7fbf2c98ab18b57fecd74d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://crophysi.ru/123?utm_term=mobile+legends+hack+apk+unlimited+money+and+diamond PDF link annotation
    • http://kaxidabifibag.iblogger.org/exercise_reported_speech.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/FiiVqia/sunday_school_lessons_for_adults_pentecostal.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/zajox-vafepumuvosi-pimekinuxamip.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/FidhenD/95285739222.pdfIn PDF document text
    • https://napopetonepew.weebly.com/uploads/1/3/1/1/131164038/9095248.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/wogodapis.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/5m5Axjb/neo._emu_neogeo._zip_download.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/gikojisoz.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/panuzaweg.pdfIn PDF document text
    • http://bujufamamaw.22web.org/40947868591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kinowazekuponaw.rf.gd/appositives_worksheet_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/platform_sandals_black_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/caryl_churchill_cloud_nine.pdfIn PDF document text
    • http://sewexojin.rf.gd/windows_7_professional_activation_key_free.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/wisavoxotelexivuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/jomuferuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/jozebakimowotirel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5584 bytes
SHA-256: e90d6a7fbeb1d639310049c5e0af974587cbcb406fa0abaeae38ecc9d43226f1
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10824 bytes
SHA-256: ac0bc14e0974be036b5f504da3d2423bd9f45d6e3a0ee9ada8fe5d895c575b11
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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