Malicious PDF — malware analysis report

Static analysis result for SHA-256 04997a5a4cd751f4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 11:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: f822a2c7f95bc1ce656a2ed8cb561ffe SHA-1: ded734a171e64ec5837f48cf1a47e286870f44c3 SHA-256: 04997a5a4cd751f443af86169124a40162d783076c0b021e7b430a4c4874acb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hadt.vn/upload/files/wajugofoxewuj.pdf In PDF document text
    • http://videlec.be/ressource/file/93637555258.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/kozewigodozizudaneligido.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tobojip.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/11491281254.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/21861574074.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/zewisutifemesud.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24922135307.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/22694474125.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/16215900711.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/47785039188.pdfIn PDF document text
    • http://ebus.cn/up_file/file/bulezazidi.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/83728375193.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902041916.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/lixose.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/zirofawudi.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/zepupiwowam.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908080043.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/68146834416.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/gukidosejujel.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/51380165811.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/6862233254.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fagapugeveturunodogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=michat+hack+apkPDF 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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 18928 bytes
SHA-256: 68da54cf950989b188111a1ef07826a2a8594c9b735b4d62cce257245fe76612
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 9888 bytes
SHA-256: b54bf426f96a7105ce22f4e6b9de34bd35f1f2fc45517717840ac10ca86981c4

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