Malicious PDF — malware analysis report

Static analysis result for SHA-256 c522558666a55f31…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 01:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd6664f378427d09fc041f828e6ab130 SHA-1: 3d5486400e792b64ea6396570261375d435ec0df SHA-256: c522558666a55f312dc350b3ac28d714e8054befea8232347173a13c20ef46be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is designed as a link farm, pointing to numerous distinct domains, which is a common tactic for distributing malware or conducting phishing campaigns. While no scripts were extracted, the presence of numerous unknown URLs suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://irinabailey.com/upload/files/14517084016.pdf In PDF document text
    • http://myphamnanyno.com/luutru/files/zajifapo.pdfIn PDF document text
    • http://divelife.kz/files/file/fuvigefog.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/taliwidudavatud.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/20311282985.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/3327360742.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/sonavelaxarokotupix.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/59848472875.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/maluvago.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kekimimiramikimarav.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/34703286965.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/8212229985.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/wolaba.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/32425491090.pdfIn PDF document text
    • http://immopolignano.lu/images/pozetiruwibapukedin.pdfIn PDF document text
    • https://pt-joker.com/contents/files/651245855.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210911101648.pdfIn PDF document text
    • https://33mobility.net/uploads/files/toguzavegewomalupude.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904043733360929.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/lesetajojitef.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/vesejujovuma.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/77045910558.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/vemizun.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/narawexukemuxazuj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613e199c4e983---41267677153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+decrease+vibration+intensity+on+androidPDF 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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 10712 bytes
SHA-256: fafe074759b2c5195441a3fd3a2761b763bbd07987dc3bacd85f36de6d1cec04
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 17740 bytes
SHA-256: dfe3574b34f93d77162ddd866802b019af38cec86d2f955ac496fa9c83317801
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1