Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e31947664c7046b…

MALICIOUS

PDF

103.3 KB Created: 2021-09-15 16:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef2e151b16d4d65a3fdc31f7c23b74ca SHA-1: 9de738ee940b192b51df08402b7986584dea6465 SHA-256: 8e31947664c7046bcc51fef198bce5a6b03ec13e8d8e9935022df020e10770bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a high number of external links, many pointing to PDF files on potentially disposable domains, indicates a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://clubberia.com/js/ckfinder/userfiles/files/gulosulapepepuzozu.pdf In PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/10025217140.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/potedubidevixelo.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/xadijogiwibebesutegidafar.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/47542700892.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jufowafun.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/32642838545.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/20569443346.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/88004400731.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nivonudubiwalig.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b47ad1d8---45493951643.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/38142551808.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vufegikusopusisoduni.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/baxapiz.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/27197862098.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/magotenukawefa.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///xefefirolixoxat.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/18506370015.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/basinade.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/14819925370.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tamojut.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/wajaxukoruwajip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+walking+dead+sez+3+ep+2PDF 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_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 10848 bytes
SHA-256: b4b1a99672e2c9be82dfc82d3a53476b865a9cd66b0b99de3be2b76522155015
font_01_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 20904 bytes
SHA-256: d8381f95d7715ac3edf9216c2d73d4f442f1c30213db1999162191d762853bef
font_02_sfnt_off000175c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.