Malicious PDF — malware analysis report

Static analysis result for SHA-256 8749695a3b4df29d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 18:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a15d0a40ec8914938954979322391009 SHA-1: 0cec15aa5005376e543d33a86c0c618967d19c54 SHA-256: 8749695a3b4df29d23ce00ea435e8bec1af0070e84f1de25fcf88058094d450b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=how+to+root+my+android+phone+step+by+step PDF link annotation
    • http://xz-brand.com/ckfinder/userfiles/files/simamit.pdfIn PDF document text
    • https://mackbeks.com/files/file/21411786266.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pixavojorokebixuweg.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/tibadu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341ade43dc7---24959796929.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/vodubebinojabum.pdfIn PDF document text
    • http://epicridesnepal.com/files/dojozikanuvugog.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/12960565756.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8e164a09---17608668662.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/rajimegemagogiwabu.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/33798334214.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1866162522614936afc1125.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/ratezupotoxuwijetut.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/89823239064.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/zagopujosagefe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lekomozupifukamin.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/39235053612.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zizofanuniz.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dubikedijexebaruva.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/43880251409.pdfIn PDF document text
    • https://emmaushuis.org/pages/39937767954.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/22877736234.pdfIn PDF document text
    • http://teraval.cz/res/file/24521485902.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/27713620167.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zixujogifudomogidugesiv.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/fafuwagegatenadiluxa.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/83375966208.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 17356 bytes
SHA-256: f9e64949164e8f44a6e69249799eb71e1afeb67a375b5a1aaaa4991307568189
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 10944 bytes
SHA-256: 77063c0fd04466e7563a21f54f66fd3ce53460baaedfbd3248474381c14658d9