Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9b62ba98ca10fa…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 22:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e49fb575fcbe210da7febf0d663ab3e SHA-1: a308f9dc94e2aa9e0650850c46517ac3796c84dd SHA-256: db9b62ba98ca10fa9791ec17fc2bea26cad026457943a6d05516b56ea15029b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a phishing lure, including an image-only presentation and embedded JavaScript designed to redirect users to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate credential theft or malware delivery through the numerous external links. No specific malware family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=biotic+factors+of+the+great+barrier+reef PDF link annotation
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/kafozadevifami.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/17496751653.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/muloturaroratesezazogeke.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nifabu.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gizujavolibafupekumo.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/45409651629.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/topiligumofupidakijorej.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/68818557128.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/deviwar.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/kudadekisazuximube.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kizawemelotimojori.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/giketozazufa.pdfIn PDF document text
    • https://la-klamm.org/Files/files/78814385332.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/69c51825392fa99c96f187d8d6060393/pijitedofigekuwiz.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/32854648074.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fimez.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/lorubosobefuta.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/62752679639.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/jotadeseruwabererolos.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/26094963523.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/magamoxojenisixoju.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/kumonakanowawozasobivune.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/fulerurowa.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/3449685608.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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10656 bytes
SHA-256: 9f3220c9cc14a9c3dbbb568c57145e396a06bde4d7c32e4c8e75f0a80f865a2d
font_01_sfnt_off0000caa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 14288 bytes
SHA-256: 23623e74402c4a3ffdcbb2ea3da3260d5e663a220804fe399e0581e4216cf842