Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd82db26d7b201f7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 21:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7986c9e929e22f6275be8cea25505348 SHA-1: d98f0e9b33998a4151bbf6451d1966335746f060 SHA-256: cd82db26d7b201f745ca1935500168443e6e4f8eb5c889132d5a425efdf979c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://webs123.com/userfiles/file/50927708248.pdf In PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/82386409242.pdfIn PDF document text
    • https://ferropula.hr/files/femifitapupesupenivasowi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/32395937252.pdfIn PDF document text
    • https://adikkedua.com/contents/files/72298394898.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/vuluxibozaratumarax.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/96021463959.pdfIn PDF document text
    • http://bamila.vn/luutru/files/69218806742.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/mapinuloxunovenerixa.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/88374317740.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/28087827308.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/sanidukepugubi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/90966007647.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kadabidawovixawub.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/lulofivoku.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2796c71a5c1e305c7f206a169d9853e8/fotukafexigijasomugo.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/61155414688.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1551671837613198e7244e8.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/10936272717.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/38735367394.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/lanawipota.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/30460715507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+tv+box+usb+modemPDF 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_off0000bf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF26 17672 bytes
SHA-256: 8d4c6319341960f884894bb557142428471f28edcc56706f94dedfa67e0d582f
font_01_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10592 bytes
SHA-256: af509f057fc67ddfda289e1f7fd124f8de2a5d1a9b0402981097cf86dcb08bb1
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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