Malicious PDF — malware analysis report

Static analysis result for SHA-256 859bfe8c7194ddcd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 18:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdabce6b6906ef1ac8974e5566916902 SHA-1: d8456b162bd73be6f1aef2d69f742ed796488a9a SHA-256: 859bfe8c7194ddcdd7ddcace239cadc81b670e96706a687b4fce9f7208432d20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or redirection campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=android+native+vs+react+native PDF link annotation
    • http://sklepjola.pl/userfiles/file/88397867712.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15158097203.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/17840727505.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/torus.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/muzivitikafalalej.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/futavitarogiwu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dabapetusir.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zabagilokafer.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161424885e0b1d---36709977242.pdfIn PDF document text
    • http://shopabrang.com/images/files/89307087467.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/43488306315.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/96900233694.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ke19ot9lvf7lmi1m92p0gv0ud4/vigebasudujipu.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/90695218688.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/94087171087.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/zavut.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fejivavet.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/fumefi.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/40451278259.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/72042215423.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vixofazuxiduminotododeb.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/ruseruredomiwefirosi.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/saxevogovaxadaja.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10364 bytes
SHA-256: 05af3ea13ef65e2dc111bda4d4b508ccd9145e76dd6ff502af17b1eff87b1cdf
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 17928 bytes
SHA-256: b0303f13665bd64522824493675443043735e33cd9710281cb07b363fa1d28f8