Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5b60d98a3c122a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 18:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df1dfdc4d42bb13805ff058e1707e754 SHA-1: ea34e877546d4c0ac7e5746afdd903bb31dde762 SHA-256: 4f5b60d98a3c122af774f7c526b7e039fed9d91088cf7bc6d326f4d7d19b4492
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. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of external URIs and the link farm heuristic indicate a strong likelihood of redirection to a phishing or malware distribution site.

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://philabc.ru/uplcv?utm_term=how+to+activate+usb+debugging+on+a+locked+phone PDF link annotation
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62035178920.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/11141260979.pdfIn PDF document text
    • https://apra.pl/files/file/segezedelawimopunex.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/teganofapubanibisa.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wobifogepumiwexagisenar.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/pefujonadimego.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/68842749527.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161368163b409b---60139461352.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/fepisemegupamuvifafes.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/69628299148.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kukimudatofefibewuxarinam.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/58818798082.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/zofugipopuvu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/migetumipiviwasaratedi.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/64341027767.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/xajinirom.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/53715244531.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/17072563285.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/4729217185.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/72263607396.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/92574338530.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/67832611259.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sojisuratodizib.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dea536bcd---94759173276.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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 11168 bytes
SHA-256: b0a6b57e92c46679d924ea430e59334456d6959c79397881a5fe1aec73b2786b
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 18452 bytes
SHA-256: ac81851683d5f98cad2e931098c4e9fe62de4e85c21303a019dab3339a2ec2fa