Malicious PDF — malware analysis report

Static analysis result for SHA-256 174e4ef83d317761…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 18:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e40b60e3be743a5e0cbf8c61f046f242 SHA-1: b8608ee22137efb4ce844a248a6dc299fb36653f SHA-256: 174e4ef83d31776119145adad4542e659f09e887a6f3d2614e8a00a6b6460dd8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, directing users to various external PDF files hosted on numerous domains, suggesting an attempt to distribute malware or phish for information. The presence of multiple unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://topup-fight.com/ckfinder/userfiles/files/92728562404.pdf In PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/bemedokifajowi.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/36891917684.pdfIn PDF document text
    • https://avflash.nl/upload/files/25397430241.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23202058093.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/83359481928.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/tejofesetozuwez.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/85870715192.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/navupupim.pdfIn PDF document text
    • https://redac.ch/upload/roranonifuma.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/winefuliwidapekolatutogo.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/fikewefazojiwima.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/puvukowu.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/99428022302.pdfIn PDF document text
    • http://heizler.hu/files/file/jepajufu.pdfIn PDF document text
    • http://istanajp.net/contents/files/55320012561.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/rikegasezezuwakofevak.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210901122744.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vufonuvafawarezobito.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/9976092458.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/fadurakabev.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371919e4829---buwemutilotebifizupasi.pdfIn PDF document text
    • https://businesslife.com/content/file/38721087607.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/dotepalawexafiwobidosal.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/75cd15181d0a8df2697080105dfe7aa5/dukijawinagafisazakaraku.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/wotadovoxuxuvifevodaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+kof+mugen+for+androidPDF 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10708 bytes
SHA-256: 8cc0fe86a4a631949a0c239dfef88345b1546cd422544718b3352fd2da85d60f
font_02_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 17676 bytes
SHA-256: 6c34a31993cd9b542c4e48ec445f11052411557745d85f38f338ce162be1ec29