Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3976b281c80f76…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 84ba53818df316df13c80fa2f5cc8801 SHA-1: 66e6e510d998cdceab2fbcb5b9e8bfe19672bcff SHA-256: cb3976b281c80f76bc69a58e910efe997ac7b4f3524e581faf8b3e9085e05299
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 0.9947

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://synerhu.ru/uplcv?utm_term=bombitup+app+download+for+android PDF link annotation
    • https://consultingexpert.eu/fckeditor/userfiles/file/15189670389.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/tadajekipugevo.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/3955370773.pdfIn PDF document text
    • https://il-gusto.com/images/file/jipikokupoxe.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/35092942830.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jowos.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nusegew.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/94639968787.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/16815989102.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/xakuguwokirexolebadije.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/naxojifeberidu.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/88249159792.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/41228864777.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/37865635072.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/91750420305.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/badekepojupepikemepam.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pavuwusudumitonadukumesu.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fosesesavedajisubewisikuv.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1c6abba7---20956340124.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/bufupibisu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/21839588910.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pewadejurasumanoziredisi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/48694322277.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fafamoluvapejor.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_off0000b7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AA 16940 bytes
SHA-256: cabcc4af80f6b132d625d15fd5852cd5e0e937def4a300b096857287857f271c
font_01_sfnt_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 10736 bytes
SHA-256: 4b2771fa5229f87e23c3a3d34ec931c506ac208a7b0102a1770535d3f652fe7a
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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