Malicious PDF — malware analysis report

Static analysis result for SHA-256 f368998d2a938a04…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 04:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c690052dd338429e39ffb118bb8a5c95 SHA-1: d562c4d056963e70f3ada069f6baf79a50974c3e SHA-256: f368998d2a938a040a9ab2c889509f57a46e1bfad042321327fa6f98649de727
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external links pointing to various PDF files, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lokalsport.no/userfiles/file/42935725807.pdf In PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/tezagipukijefubopalozated.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/41880367064.pdfIn PDF document text
    • https://kermanrooz.com/img/files/zedubujun.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906063428780.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/86053928243.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/85883549815.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xibiguzuxi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/goputabibawowenexi.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/27875107485.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/leruxolikureturu.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vosojaritede.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/80957997820.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/sogel.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/sagerinawufif.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/vazuni.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/riwirutujavugujulo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcec1bd3---xozoniwigamafofivi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d355b6008a---95545474881.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/satuf.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/38442633657.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/69577106252.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/663694601.pdfIn PDF document text
    • https://deepex.hu/hirek/files/jewifaminirejuxixupip.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/joliregilumuwokifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+free+software+download+full+versionPDF 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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10764 bytes
SHA-256: 0fb8d52e01b274608129ef8209a4460b4bbc40a1140507819a4b1921c5d99741
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 16760 bytes
SHA-256: c21dda1a0ec6905fe05f854fa6a1e98caa73f8cfaef83ee2431fca219faf413f
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1