Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f98b4bb1cb067f0…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7ffd2e030c39ce2a488cb471fa8f7c4 SHA-1: 9d28e3b246a6bdbb583e4e5b36e4a8c7f8b3fe6d SHA-256: 3f98b4bb1cb067f0f644c440e3343e2c924668a08e429a44b73746f292b5714a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external links, many pointing to PDF files on different domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it's designed to direct users to potentially harmful external sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atasuorganiktarim.com/upload/ckfinder/files/89450619797.pdf In PDF document text
    • https://norservis.info/files/files/lutivikonabonuzef.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rajoxesumakibuvurepasikal.pdfIn PDF document text
    • http://peoplefoster.com/pliki/lukefawabora.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bukidabolus.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/77077345848.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/80199794079.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/74798523485.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/voxap.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/43389807079.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/nenalib.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/19193135736.pdfIn PDF document text
    • https://senfina.top/uploads/files/35570660099.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/34253734708.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/guwipodemakalofasod.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130487912149---32925080860.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/duwarevumefemubulanagem.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614321d94db12---59068446635.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/gawonu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89800200691.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/4010998936.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/19596418099.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/18249408315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=total+sms+control+download+apkPDF 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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17636 bytes
SHA-256: 21346575ad32fcd63c38af89955fda24554142adc031179a3514ee8e2de9c66c
font_01_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 10592 bytes
SHA-256: d615be4a158b80fcb68c2a200197c25ad5418447425e772620831cabea43ed22