Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4dfe7ee6550632…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 07:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 60d5928448b49807fdfd02dbcd4e4e72 SHA-1: 6db0c48d236858265811cc653d9df45d40e1ed80 SHA-256: cf4dfe7ee6550632af75c7d084f5a44afee8706e6d3e3969b9bda878e5f27fb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, 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 related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cructi.ru/uplcv?utm_term=yorkie+poo+puppies+for+sale PDF link annotation
    • http://gesundimjob.at/images/content/files/juxuvon.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/45540925497.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/dumegilaxo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2fb9a28ffcc87cff3f27a6208fa0826d/lomizapedisotubelabimox.pdfIn PDF document text
    • http://capri.lt/userfiles/files/43364945272.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/78903515566.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/57002692286.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/59069908499.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/wupizirikos.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/kujivokum.pdfIn PDF document text
    • http://polipack.ru/content/file/53104336724.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/zorovitisorobodizajoranu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/timabeteziroxijibob.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/zuvaxunufiterepun.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/73449262015.pdfIn PDF document text
    • http://health-bridge.in/upload/file/76812029412.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/wovosazikiduvasiruped.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210929190322_5a8wao.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/sonogotosutenun.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mofuzovijoniziwixufepi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/betedamozem.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/zomumabin.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vafuxukuravikifugezalom.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/jilufisaw.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/26999627728.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/57109906102.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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 17268 bytes
SHA-256: 86752d8e028129f99442ed52164c2adf1107511f37475925ed86400e13c31107
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10324 bytes
SHA-256: d581b2f5f436c5c3adff08b6f964c0c10a5dedfd0b8d3714bd24fd203e3c700c
font_02_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1