Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc1804ae07173fa…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 23:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63b2bde8078544ea58894a345f8cb41a SHA-1: a868042bed52415a40b12325c6e59d38f89c369d SHA-256: bbc1804ae07173fa296d7cda2b25f606b22da61dc0a9a43e97bec1ec31afd5ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the URL "https://huntic.ru/uplcv?utm_term=windows+10+minecraft+redeem+code" suggest a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=windows+10+minecraft+redeem+code PDF link annotation
    • http://sincaremedicaltour.com/js/upload/vobotasozeb.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/15032445335.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/72251743509.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/71870959517.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2e1af2b4---85319032843.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/8418221550.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kujagifajonilaxep.pdfIn PDF document text
    • http://showdoimovel.com/files/files/povule.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/232356922.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/jugubusetos.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/kutexipirovuramutujotem.pdfIn PDF document text
    • http://birdwatching.sk/media/file/xukaz.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/55146481675.pdfIn PDF document text
    • https://premium-house.uz/images/file/jovufof.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/682e9c2d4feecb22a845ec3b7fac5dd2/98396128961.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/rofatepub.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/momuvowofalosupuwagof.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/64351997513.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/58058527974.pdfIn PDF document text
    • http://momsystem.ru/public/file/24825207990.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/56518626606.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mananugekubisu.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/30494757077.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/24573084854.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10844 bytes
SHA-256: f655101233e0fd20c262e856e976b09c287d5e9e9058e71c1accb8810cba0440
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 17848 bytes
SHA-256: 4badebdca5e112367398fe5c54a34f18d8642e01f055a35ed8711de0ab68c274