Malicious PDF — malware analysis report

Static analysis result for SHA-256 8045c93cd824259c…

MALICIOUS

PDF

70.9 KB Created: 2021-10-06 04:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2ffe585b5bde047a963a795b3267ccc SHA-1: 18287d8e48598c6725f69c2b0b74a85114b0218c SHA-256: 8045c93cd824259ce885b4d2d6a3112bcb367eff7f39d6db67f496d1358ddc85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host similar PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://theatergruppe-nestelbach.com/rogan/admin/fckeditor/bilder/file/88281036211.pdf In PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/vitukosuluwemiripulisobap.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/paboxarubizudaxuzuna.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/33757317467.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/pokawolo.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/masoxaw.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa90acfb3---zixumezuw.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/75708211094.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/sejoxuxukedu.pdfIn PDF document text
    • http://fabtur.ru/upload/files/jelemagijukexezinatosi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161541953d71e6---zidojexe.pdfIn PDF document text
    • https://best-label.com/upload/files/xasixibuzojas.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/27719173077.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109141218307414.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/46802869354.pdfIn PDF document text
    • http://strandedtattoo.net/file/29174608634.pdfIn PDF document text
    • http://telektrans.hu/editor_up/72597087129.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/jolozexoruvogesaw.pdfIn PDF document text
    • http://budka39.ru/files/84246350230.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/51748025467.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/14254805577.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/wunizevubufifigokotogetap.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/41282491705.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vasebenag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=an+example+of+a+scavengerPDF 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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 15396 bytes
SHA-256: 9e54e48039aab9d81df0243cad7935b79616ee1e5bd9cd733b09fe17a9a93793
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10780 bytes
SHA-256: 958f9a0d67d23df6dc879b379cf12f6e02ba2f3b093937c4d10478c9e26731f4