Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84f37d08f1a7799…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 10:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe13f32cee5d0325e4268d241b652034 SHA-1: 166b7ec77bf30efe07d54f8c9965a164222752a9 SHA-256: d84f37d08f1a77994da41a251f8c1564b09c2eb1aafcf4c63c02478d0c682243
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=best+offline+games+for+android+play+store PDF link annotation
    • http://gptools.net/userfiles/file/99740932817.pdfIn PDF document text
    • http://manu-transport.com/documents/file/xaboxafapox.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gejadozaxugefatobidobux.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/5106088004.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///76557001531.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145838601807---tojodivurofodexo.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/piloge.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/mufixevokujodonomok.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/fidifagevusunip.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041842266732.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/30470947607.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/83953742931.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/82716211810.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/mojonubefilutos.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809a09fa5a---gefexedasonafimujekorudoj.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kubekupowudiraperokip.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/39727990681.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/penulonugalupubi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/7995944335.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903025158105197.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/lizalemugekem.pdfIn PDF document text
    • http://gyliver.ru/files/files/nomixazo.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/53268059603.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210912_021737.pdfIn PDF document text
    • https://sapporopools.com/contents/files/toxapinewadigonunewuva.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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 17608 bytes
SHA-256: 9ded299652bf348b0aa9e2613633ead147232c953de7217869085b97c7b2cde4
font_02_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 11008 bytes
SHA-256: 814d649ce5e665a1ed3649e619a41e4455bc582abcf19a16f94400719013ff7d