Malicious PDF — malware analysis report

Static analysis result for SHA-256 424910f1d4acee25…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 04:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fe06d017ad59645be50fccaf422cd09 SHA-1: 98d2f28658732f894ba5e4f99d10ebd00143a383 SHA-256: 424910f1d4acee25b917e4eeb0a315bcc633cd536a97922f3cfdf764bbad5ff4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, indicative of a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e004a7e07---59448745969.pdf In PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/56202642049.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tunobo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/loo04tf9mpec5sm2uvoab5vnt0/loxasarusaluvuz.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/fiwepa.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/64613283380.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdfIn PDF document text
    • http://domario.ru/userfiles/file/52993826529.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sidofibanusekijuxanod.pdfIn PDF document text
    • http://epicridesnepal.com/files/wilibofokixotiw.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jufubikerigedowejotugo.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/potojuvepa.pdfIn PDF document text
    • http://synergyproperty.com/images/files/63674076829.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vodonisifedojuni.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jakebojaxuzitewo.pdfIn PDF document text
    • http://wajl.net/img/file/202191122032.pdfIn PDF document text
    • https://polandpools.com/contents/files/5479842929.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xufezafiwiva.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/13750987822.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/68952535068.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/kifosokataginaxadakirij.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fufewexonokoxekifemexe.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/varutovuzanezali.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76085935092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+online+rpg+games+for+androidPDF 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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 10892 bytes
SHA-256: 8063c64ebf4b11aed123969447c577233163c822e221d3b99350d8939e21100e
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 16924 bytes
SHA-256: 7c148b952328f16213ac343cd3014fac7a92fda7ca51f1772c52a0409e67c2ce
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1