Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d417a985b40f7af…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc6d03493bf66e5886f6c71b305f7c6e SHA-1: fa4c89cd9c2da3c76d0f7878f7b578404b77ebac SHA-256: 5d417a985b40f7af6cdd208e3a3db9eb01abcd34c9c8619a19090aa54f83d534
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using multiple redirectors and potentially malicious content. The presence of external URIs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=download+game+bola+we+2012 PDF link annotation
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/9673759221.pdfIn PDF document text
    • http://tid.vn/upload/files/71179318024.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/88221251177.pdfIn PDF document text
    • http://nprofit.hk/userfiles/suveletefiditesiw.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kifujutijab.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/mufasajaxube.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/91349686396.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/bugotesodilasuba.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/vagusixejitet.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/48349671901.pdfIn PDF document text
    • http://fluorescent-training.com/file/63827007468.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/68689304929.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/8111625539.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/50845759728.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/varizunoko.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/46842982332.pdfIn PDF document text
    • https://pcetravel.com/files/file/17739569019.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/15430759947.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/zuwagufa.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/44258384247.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/losamunanifipulirixalesu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6e61772c---54871311447.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357c213430b---34455893480.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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 17684 bytes
SHA-256: 909321be22d78134cdde342dfd632885c3ce680628ab05f6241d524eef4c8015
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 10656 bytes
SHA-256: b130226bf07a5268eea9231fb36a12f112b31f983188045e27f6834c59869d32

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