Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5adbcdfb0425232…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 03:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6a05ecf701968bd79895ff3e2e588b5 SHA-1: 24c64cf5d95140f96a9aa8137e4ff740b34b05c0 SHA-256: f5adbcdfb04252327f9c5e3e39c14d7ae4eb17e200b610335c461af820f6a25b
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, including one identified as a potential redirector. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier output of 0.997653 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=apocalypto+full+movie+download PDF link annotation
    • https://redac.ch/upload/kukojerijef.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • http://oris-am.com/editor_up/fukelepejidegi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/terexerudozukolapixuko.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/vitiwusokeziwukirepisisa.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/29981826663.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e629088c1960a61fd531b45f525fde44/mefupinukololefunarulanax.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/nisawep.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/57897432915.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/wewesoforuva.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/93504268700.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/3847190419.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/gajamojeloborovi.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/16848562557.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/77583696191.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/66591698187.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210911_0CA37330B6764E2D.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631596128.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/40541581332.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kizemojanepideb.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/verusigamivomepefezod.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/5590382194.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf6a28b80---zobilusenimuxojata.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 17256 bytes
SHA-256: e0109578d53da9c8f2ffff2f90c77d31fe880dc3c40d4fc23b9ea7cad1aa061b
font_01_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 10860 bytes
SHA-256: a45a08c8551f6ea32f466ac2fe4ffccf6fc322379c1c524d888126114f35762a
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1