Malicious PDF — malware analysis report

Static analysis result for SHA-256 cceb23c4022aa5a0…

MALICIOUS

PDF

86.4 KB Created: 2021-02-16 19:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2ea6a21710af395359d9097563e44ee1 SHA-1: 3bf6bae8756be74aa5d8f1e8a39e7c291c413231 SHA-256: cceb23c4022aa5a00181f224f8cd7ec601c3b8303a672dd6c197753ef3e2e525
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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://leonvi.ru/123?utm_term=matematicas+financieras+formulas+interes+simple+y+compuesto PDF link annotation
    • https://cdn.sqhk.co/fepexeguma/hdhc4gf/cars_for_sale_near_me_under_5_000.pdfIn PDF document text
    • http://sentytld.online/rimibusugatazademijuzbc5dk.pdfIn PDF document text
    • http://love-cosmetics.shop/journal_of_the_academy_of_nutrition_and_dieteticsz71nx.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/GMgieR3/53996466604.pdfIn PDF document text
    • http://formverifiedbadge.com/507277310170cw89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_5fcc8ae85bcd1.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/idxNCjf/59505871360.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/b5d59198c630bf5.pdfIn PDF document text
    • http://iuts.space/lincoln_financial_group_fmla_reportingql0rh.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/6eb4a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417815/normal_600024383c826.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/xikatanorijebo.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/jbhhuRZ/33634820797.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
    • https://s3.amazonaws.com/mibiwivanetuj/bth_ms_bthbrb_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/comment_fusionner_plusieurs.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/bounce_tales_free_apk.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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 5152 bytes
SHA-256: 101bd6fcbc4a066884d276e8f925391283521202bc0eef5d297be1b7791ff27a
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 12768 bytes
SHA-256: 396f5c299c51dd438453c0da40153d7362806a81a4d178ed6ba8e18a8dbb7c0a
font_02_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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