Malicious PDF — malware analysis report

Static analysis result for SHA-256 237f9675e161a996…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 15:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ead77b8291a0d6723d3993809a8aa2a SHA-1: f7ea2c902fc8eea7fa4e5ab92358ca57f8de9053 SHA-256: 237f9675e161a996292d3e848c07285d37684ac53ba4b7379cab064861d54149
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://budapestpainter.hu/ckfinder/userfiles/files/nakamuzisukitana.pdf In PDF document text
    • http://shijijiaming.net/filespath/files/20210906045637.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/mufosidibomo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dusasew.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131343c6507b---foxoxa.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nujibegebuvajetejifus.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/15526933088.pdfIn PDF document text
    • http://apcmagon.com/userfiles/68576658910.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/74763444754.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/86497294226.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/getavibimefajilabazemi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/67170067050.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/89683990699.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/keduvotiledixafit.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/rutuzidufijegerotujupati.pdfIn PDF document text
    • https://banghenails.com/upload/file/lovotodoriwavobiw.pdfIn PDF document text
    • http://boxethai38.com/upload/file/metuzuxoneredamilikoni.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/38044640788.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/newukenori.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/jubejozozid.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xetalakinuk.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/muwumulele.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/87647387673.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/63956762778.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/37348735510.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/61436015420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=real+soccer+2012+apkPDF 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_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 10504 bytes
SHA-256: dd2e8fc9166bb1af39b0cb61395c518a75e86fa71f2c653ac8d16f236293a4dc
font_02_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 14956 bytes
SHA-256: 3efe46ae0056b840206bc4ececd4eb7609eb668ac703db3fc067c7c24dce3115