Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b0ba13f194b57…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43df185d43cf46c6623211437f4d6f66 SHA-1: 5e78c9019177b71952c63ee63c4d6fd9f7d842f4 SHA-256: 4c8b0ba13f194b57f17bbd3c6d3081ab904b0e786e805ab226bf7cc020d13974
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect the user to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=devil+may+cry+pinnacle+of+combat+apk PDF link annotation
    • https://daiichitravel.com/uploads/news_file/37210154227.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/lolosotipurotawumelog.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb4964a05---36092500052.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xulaxukigolilobadoxivupi.pdfIn PDF document text
    • http://eternaseguros.net/files/files/sipisuki.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/timovefuzoxidezudone.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/tuwokakimogowugap.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/muwitugodezabono.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/17563643136.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bibasot.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/gadobaketuxigomojewumo.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/kojawunawukuwevamibuvej.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2048431622.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/dugejesokalinan.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bijepuw.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/zavefuwaf.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kuzosare.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/gidonesozaziwusud.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/punipivet.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5366e5eb8264dd7843acae15a7682183/94965937684.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/66436767483.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/gakosek.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/gajawarosifagunomabupe.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 17600 bytes
SHA-256: 2427cd08494c731360ffc918a5cc249b68fc8201c4fbd3dac17f930dd5b52db6
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10884 bytes
SHA-256: fa2432b2d81013594ac681d76777f6217f52844a982fcd14cea1ac5436c14321

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