Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ba65ebefd60c85…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 01:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4c92fa59fe76332fc50a687ab722749b SHA-1: 25c523187a5267d3e0c7ef3724eaf5e1e3b5e193 SHA-256: c3ba65ebefd60c852a2de1f535229ac107e8a27bfc95f2dfa5bf94c0474635a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and is structured as a link farm on disposable hosting, strongly suggesting its purpose is to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://queure.ru/uplcv?utm_term=lego+avengers+mod+apk PDF link annotation
    • http://isystem.hu/userfiles/file/80151279279.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/bokofipisusuri.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pitenagoresedokumitobe.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/xozetaseguvovinoguta.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/15157706285.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/22495677280.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109080108048677.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416124c2fa6---40412082591.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/8097716800.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/sofajifas.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/movowimudijuperijaku.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/rerisamotamapitimiputun.pdfIn PDF document text
    • http://househouse.it/userfiles/files/4407146932.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/14557390912.pdfIn PDF document text
    • https://porfic.com/fotos/file/mabek.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e10645fa---xelatukujosuvakulotifipu.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fotomozafikuzanumutasabi.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/demusololuranizedos.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/24304559539.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zufurepavejobabazimewi.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lidab.pdfIn PDF document text
    • https://akconta.com/uploads/files/51552182583.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/96447253595.pdfIn PDF document text
    • http://regmac.net/userfiles/files/13208932391.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10612 bytes
SHA-256: 4ae0f653b31d730e4b084c7aab5a9ae5597806e963ccd07f686e731ada6b15fc
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 18300 bytes
SHA-256: a46ea498a7ccaff3d6997db19ce8216bd7f9edf8535578ee52d73c8901d24e24
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1