Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ff71a16eb652f7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 22:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e02946cec418568e81dcdb9d0b05c8e SHA-1: 974f6c0e8a713ec08924416ff1ac838c5af24231 SHA-256: a2ff71a16eb652f714f75016f86fed291b97ddf59b04ba80288d9a9c88e7d35e
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 redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a deceptive structure for user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=assassin%27s+creed+rebellion+download PDF link annotation
    • http://salocchi.it/userfiles/files/50804196707.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630760294.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/86610540855.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/jatunel.pdfIn PDF document text
    • http://veitali.com/upload/files/somonufomow.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/59418625868.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/81673333861.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/20266912590.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/27308703698.pdfIn PDF document text
    • http://pi-consulting.ch/download/8035433708.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vefodenetonowevufizuvom.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/99339158048.pdfIn PDF document text
    • http://hodori247.com/uploads/files/goxirefakeses.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210901_317E393008A050AF.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/41651988522.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/jobowezowapixowa.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/96097546872.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/69492465541.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65229533345.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/surizovugomitabivaw.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/52745959436.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/golurirarike.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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10508 bytes
SHA-256: fa500a35ba27da0b060ffe0e916b2dde94054cf143e3b22b3062e7b710be4699
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 18824 bytes
SHA-256: ca8b891a2d5d0277b0d5c40b0e89e6f80b44096cee42c16ad3b00a7a2e38ec14
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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