Malicious PDF — malware analysis report

Static analysis result for SHA-256 9578fe018309086f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 02:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6221e3b45c1b07707565402db0945fb SHA-1: 1562d9585b679b35a3c863abe52a2d2329e25f91 SHA-256: 9578fe018309086f68a940ddeb50de3153abdf5c05b029ac7a0c8602a4d9855d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to download potentially unwanted software, as suggested by the 'download+overkill+3+mod+apk' UTM term. No scripts were extracted, but the presence of many external URIs points to a malicious intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=download+overkill+3+mod+apk PDF link annotation
    • https://alarouba.com/ckfinder/userfiles/files/70535389349.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/paguviwuvezazotulifi.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/xavarozuwoxuzumureta.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce9394a5d---96861831333.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kizemojanepideb.pdfIn PDF document text
    • https://porfic.com/fotos/file/7078083710.pdfIn PDF document text
    • https://shidoremicrosys.com/media/52536349670.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/77a7a2kf6u7vntb8np6uarsv1c/68923031226.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/1938128945.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/tanowamamokivirekiwoj.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219182317533461.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/miforuralopemuw.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fibunedobapuvedelipodiju.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fejogikutoxabavinidaxab.pdfIn PDF document text
    • http://yoron.net/up/files/73092318719.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/bezuzipi.pdfIn PDF document text
    • https://datajournonepal.org/files/gekexowamupatumigisalow.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/fixazibijimujenog.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/zasatifiwovoj.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/bimigupolet.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/45299847934.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nobelowaxafaropege.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/34338282876.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/subiwuzuro.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/kuralidu.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109120643165836.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_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10704 bytes
SHA-256: 761076db447570787683a0f101244975afe176c10f227f875502edd4da061deb
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 17800 bytes
SHA-256: 6bbc163c75227feeb0a03e7014d594a2fb0534188d9a3856962797de36c74bfe
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1