Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61bbf9a71bedea9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 09:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f798966a4dd53f51022c3df28318aa63 SHA-1: f1fc144e865cc4d0e33145a09e587494adc2c7f9 SHA-256: e61bbf9a71bedea9c4bd3fa94ebf595fd0c8efec88b67157f05ef70e64ce7248
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://brawlcall.com/ckfinder/userfiles/files/55479103127.pdf In PDF document text
    • http://ahlhy.com/uploads/file/041113362502.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dewofawazojexuzezagurise.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912090803_1876132808.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gojanulefog.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/zover.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lidabojo.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-09/images/files/gumugazodegusafap.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131799be3059---wusosixasujesesutav.pdfIn PDF document text
    • http://canoeing.by/pics/files/bixidanor.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61395586abd67.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/dagowapinuneranofezuxo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9b625d151a3985ac94976223acb0de2c/vexufosiside.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/musabodopagevoge.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///82059338125.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/77834958554.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/losurodegufigusinazowuxir.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/difikovadepewipaxijelunu.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/54826553768.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/16385345724.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/gixikowafulidam.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/13116017549.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/27861775098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=aumentare+il+volume+delle+cuffie+androidPDF 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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10616 bytes
SHA-256: 6004644df2852f7ce9df240df907f5a8e68969f27c7877ee0540650ddf7d292c
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 17324 bytes
SHA-256: 89fb661741d4b8720aea811f7c943a144d8832a55628b897d6c8f8b0947d9ece
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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