Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebc7c9f331b4bc8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44fe18f0adad12c9ee07b8a57339dbf2 SHA-1: 4ffb7fb73c77d1e5ac8ac6f08a8308bb8e1b66e2 SHA-256: 4ebc7c9f331b4bc8816ec551b391a6b4f6dc587ab6c7797161e747f4f0ae1107
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to direct users to a network of potentially malicious or SEO-manipulating websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://olympicthesportshop.in/uploads/88422930562.pdf In PDF document text
    • http://uniquehotelsolutions.com/files/others/14158098873.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/belebivejibudadepeb.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jenigejajosarexuza.pdfIn PDF document text
    • http://bresky.cz/res/file/78231200130.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_1747C39A10E81FE8.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/lejawuji.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31977797429.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/gelafovaxosikefevuwi.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/megafeweg.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/tibogodi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109120624189963.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/napulusuxumubotumaj.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sazefukojox.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/86372318691.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/ganejobitopupu.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/gafesuzewovudaxi.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109161635515565.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/93765616484.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/19970584296.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/82983869502.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/3828329623.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xupiwitewod.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jofedudevosobarale.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/76785101262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rupaul+drag+race+season+12+streamingPDF 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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 17012 bytes
SHA-256: 040a6c731da7474f534196237959c2a494079318e10867b17ff4c5496d362274
font_02_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 11176 bytes
SHA-256: 1c06ab099add96d405edaf1938d3bfa8ffd75cdc37847b8bebb04c197826f05c