Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17d685c99050670…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 01:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36d59eb205a25c347ded4ae0de676e8c SHA-1: 0c70c68f447d200684e76976b4815a514a759ac0 SHA-256: b17d685c99050670d5282331b521a824c3d1583449a330983824c60aec672f18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting an effort to obscure the final destination or distribute a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://moolans.com/uploads/files/lipemazawer.pdf In PDF document text
    • http://gordostcrista.ru/userfiles/file/6155440306.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/sagoraronuriv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4209b5d35---10680469988.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/niruxisuwipovefi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091649495130.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pokemi.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/80888291634.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/tugatinefex.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba94ee335---86413694467.pdfIn PDF document text
    • http://peoplefoster.com/pliki/vorabumaxitafubofef.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/buwabelovalogizo.pdfIn PDF document text
    • https://designclarf.it/file/47328131542.pdfIn PDF document text
    • http://berbun.com/user_img/file/revokatexofebajope.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/302149641.pdfIn PDF document text
    • http://swhos.com/upload/files/31715384871.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/68206227093.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/71127461897.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xezadezevozuditufelotamo.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/52218625641.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/51808432685.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/2131410715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=leaf+cell+structurePDF link annotation
    • 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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 10072 bytes
SHA-256: bde90321b2333b7addf2a8de69ef9f8fba83a3eee14d1307f856e184ade2460d
font_01_sfnt_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16788 bytes
SHA-256: a66ef95b44ddc5120d8439aa4ce8a326a4d44574f2ec3505cf8ce0b7f87ec888

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