Malicious PDF — malware analysis report

Static analysis result for SHA-256 f487e6467715ac89…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 13:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 299535dd49f31032cc4816a18e68fe01 SHA-1: 4d87cf3942ee596981de533bf53a189b7904a947 SHA-256: f487e6467715ac898f786a721388fa0d1de3722f4c1770d71c31d7eb7de7d6b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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 http://fractinvest.com/uploads/file/zibep.pdf In PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/sanozo.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/kusutajinitalosuvonod.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909155913.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/3841294937.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/66133337534.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/sozimisoduxik.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/2628637074.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/jatugobaretozetemowirawed.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/36196015428.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/bedofuga.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9752b790a4688fefc5ff0aed3abea4cb/28208549420.pdfIn PDF document text
    • http://krzeptowski.pl/file/refelam.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/34680170792.pdfIn PDF document text
    • http://contelex.it/userfiles/files/kejopipelabometalubojesa.pdfIn PDF document text
    • http://htygroup.com/upload/files/maxowupuvaxewibigobogimex.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/95676562902.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/50824019606.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210926104424.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/17574445291.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/98813871186.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luludegake.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/90746113686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=weird+soccer+factsPDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 15332 bytes
SHA-256: e3be15a7676c76921227558aba8f50d41f3fd82eecedd22374565ef11c850c32
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10312 bytes
SHA-256: 54229634a0c780a56ed2dccc01144b49fce4493e015fe64003b97928aacafb4e

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