Malicious PDF — malware analysis report

Static analysis result for SHA-256 87868b076dbcb288…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 15:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49404d1ce3789fa40f6a5f119146d84e SHA-1: 1c80de41f91a9bf9fc71093bf673948fcf53b5e1 SHA-256: 87868b076dbcb288b7983e7adafecf7ec3d744f904ad37d0ebb4c348da2c7ec2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=refusing+c+section PDF link annotation
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nilulejedonuvibu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a4dbe8ee---xagowa.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/mafodupawetivis.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/fapitozatatiborivopupivil.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/95495147291.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///93516557769.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/nedegadedakuz.pdfIn PDF document text
    • http://ukrfirework.com/images/file/nusogivujitofizenukujek.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81678382787.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/99633765347.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/migoxonip.pdfIn PDF document text
    • http://hla.vn/upload/files/moduwukifejazigev.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/tozezolinibo.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/narasib.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63993135425.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3942a872d41dfa0c3779e2df54ccb886/24458691644.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/sejef.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/gipalivusopoponi.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/fikeza.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/53740653548.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/61597093423.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/volakaj.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/laworibasosebaluz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 10348 bytes
SHA-256: 11ddb766e965f69b85b37a3b1a09085dd143e70e864ca9e76c476f1647adabd2
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 18876 bytes
SHA-256: eca739328332b9943f6be5f45a5c2f510a89683a50ec0d822fdc1d2e03c71212
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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