Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabaeabb4ed97a3e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 16:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef5ffd2b0fa170149c6d4ec29c666d1b SHA-1: 4b3ddc38867db3daa7554ff92652434ac287f94f SHA-256: eabaeabb4ed97a3e1305f0550cdab0e0e47045db034936e7145a3c31068bd964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=dark+theme+for+chromebook PDF link annotation
    • http://cancunday.com/travela/img/files/topuferumasam.pdfIn PDF document text
    • https://bdata.vn/upload/files/97483785405.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rosaginak.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/wawemuj.pdfIn PDF document text
    • http://philipsphotographystudio.com/64720163187.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zivewukutujufe.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/18509173927.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210906080719.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/89109621993.pdfIn PDF document text
    • http://jinyezi.cn/upload/ganedoduman.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/54957990601.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210901_DF2083014B49755A.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///44046171196.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/tilasewurafijederano.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/44008958976.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/65790025664.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/49999989520.pdfIn PDF document text
    • https://www.confirmedtour.com/files/vewilafifowa.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/39577536602.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/86990125623.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/61702057019.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913140645.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_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 17976 bytes
SHA-256: f967163a7211d73a71c80e4d11661eeeafd81af6de79333ba202e44592064652
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10424 bytes
SHA-256: 64c6efe880610ff0dc485b15f45a87fc8a70ff0ddb6efe0eaa3e21f7773722be
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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