Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a3f2e5842939c…

MALICIOUS

PDF

62.3 KB Created: 2021-09-08 20:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6b45e6dbf9e6705face475968128547 SHA-1: 9dd839dfca160af83e36d27ad5c5c6add3f275be SHA-256: 1b2a3f2e5842939c0d4c0d3f71fc2f79d33795d349fe91b99d68b46c25744e58
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains. This suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7183

Heuristics 4

  • 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
  • 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://rkenterprisesonline.com/FCKeditor/file/17889195371.pdf In PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/pugiwevijuwabakemeg.pdfIn PDF document text
    • http://ccshecea.org/upload/files/zodejep.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/9499184633.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/34836331060.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/20611174234.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/62672249701.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/minubobezuxiwijexemotutub.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.pdfIn PDF document text
    • https://gangnampools.com/contents/files/48789742924.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/dawekukezudarexik.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/68983381703.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/gofinupojuki.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/54131949484.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/zamav.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lujibipakawevupopitidekal.pdfIn PDF document text
    • http://manenshop.com/upload/files/79644692687.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/sofujusesonufe.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/80997990591.pdfIn PDF document text
    • http://alkanboya.com/files/file///nelanafa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb628eea83---84564895373.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/16592817528.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/nupusofun.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/zapotoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=acids+and+alkalis+worksheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A2 10624 bytes
SHA-256: 9f10e03ffefabb0edadfb01d33bd9dcdc635f7410154ebadb3be8c8d7583399b
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 16056 bytes
SHA-256: 840b9c4d53ea79c6f83d5cd19d612b67bf447af328f594e9afeadd9bf01eac44

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