Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70c89b9a6b2c70b…

MALICIOUS

PDF

78.7 KB Created: 2021-10-01 09:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad5ca592e843492c33a8efa0a403bd4a SHA-1: a3ef939177590d260ec335a45bc3b123850523e8 SHA-256: e70c89b9a6b2c70be894f24f894be8ebd395cd6c1b449baed0d5c2df1061221a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=fk99+smartwatch+price+in+pakistan PDF link annotation
    • https://stop-remont.ru/ckfinder/userfiles/files/63913752017.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/15226005511.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020141552873.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/58345722341.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/15562688472.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/giroxuv.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gogukeduxomazuru.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/30719041357.pdfIn PDF document text
    • https://dintek.eu/uploads/file/kejagamigusowu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/14028040163.pdfIn PDF document text
    • https://5uempat.com/contents/files/97527334530.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/wutew.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/xilubejonapafarefe.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/zimafukatow.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/89060450215.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tofogowoxusikemiwegibe.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109130419381923.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/basiduwalakogujasugozum.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 10796 bytes
SHA-256: f1bb7c879f70029edca3a0008a25b230871d67dc386a45c8383c7cb252c73035
font_02_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 16596 bytes
SHA-256: b8f4612daf03c0de81b8b34dcdd655d3469231a07e1f17c18dc0c8349f6911d3
font_03_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 20800 bytes
SHA-256: 07a307d65057e0811aa1bad652fb3802ec8cac8b39f4b390e883f1edf2a3fa0b

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