Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5df0f9152edca8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 09:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abdab9fd391ad6f5224174bfe3b853f6 SHA-1: 834f9182ee78c485c46f034734a68889d4e4d534 SHA-256: db5df0f9152edca80e960a9f3fb22e3dc4383b3a9d1f5fac9ab8e3456758fdc7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=install+office+365+on+chromebook PDF link annotation
    • https://danielfelber.ch/userfiles/file/joxuririfepewe.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/goduwuzisanirofifunisor.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/61494226106.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/ginelifogedogibobew.pdfIn PDF document text
    • http://www.polni.si/Images/files/rosidodotigujase.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/8270107004.pdfIn PDF document text
    • http://gaudi.tw/upload/file/vopisidulizizo.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/pugabegorobirixuvijosebus.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/38973437206.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/73948966540.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/movatalelagesejino.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jewodarofutov.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/82086122427.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613523221d1fb---mazalujamiwazuxevuva.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/34072602752.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/kisenigokoxopalugox.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/12164669580.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef0e335e13---80920048215.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/96512661375.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/senokiwafelo.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87943903376.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/vuvepiwavubepuvupe.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/62456442917.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///55135070422.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_off0000b696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB696 11256 bytes
SHA-256: b941c38fe29464055316d2b9324a4da4f27a967fc296f2c5571642cc0fa52dc5
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16644 bytes
SHA-256: abb35dcbe3608d7f53ee694df731e34b9529338e5f3f5740ce29384a59e46181