Malicious PDF — malware analysis report

Static analysis result for SHA-256 3102a579358bf9fa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f2021117e4fa275b70238ba63568405 SHA-1: 6e1621e72e3fbb1f3a5c45ea83bd3980d7050de2 SHA-256: 3102a579358bf9fa0ea7bcea645a6139894f4cb47aaa4ab7728ee373bf6c4289
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=mha+season+5+dub+free PDF link annotation
    • https://oncetrabzon.com/resimler/files/23605505521.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///97180536614.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lavuroxuti.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tuwexurasenurebij.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136338da3fc5---wunanuvirozuwuvoju.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/66916794978.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/46433349415.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/10198405321.pdfIn PDF document text
    • https://virker-ikke.dk/files/56199792747.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/47649971941.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/86987411885.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ligevepokovajasi.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/fifoxalenar.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/milumufopezugaxakujizu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/36532270205.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/rajotewalofagatuxaku.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/1058302149.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zogafebol.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/gajuwemeziro.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/13861695501.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/xumuzesimaremomi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/8699369539.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 18036 bytes
SHA-256: ac9cf7d1063fa0e91b2e3f805d22176342e95de3fe2d6cc31d12244b532ea7b9
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10580 bytes
SHA-256: e69301de4a7d22f4cec30c3e609e7b3e730521ed2db0baa43b6350bccc623c2a

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