Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8785ebf6bcdcc3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 04:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 216ea6c12e7946a3c66c7ae866b3cd07 SHA-1: 0fd303bedff2492f380dd9df86b998c38fa48c85 SHA-256: 2c8785ebf6bcdcc3d9c9e2c4f3658b9852ffda30b88f670d05f5d39227e42f9c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a payment redirection lure. The document body is heavily obfuscated, but the presence of numerous external links, many pointing to PDFs on different domains, suggests a link farm or redirection mechanism. The SE_PAYMENT_REDIRECT_LURE heuristic strongly indicates a phishing attempt related to financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://brazilairporttransfers.com/ckfinder/userfiles/files/tositetaz.pdf In PDF document text
    • https://rajatotogroup1.com/contents/files/tivivizapo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7e78c68d21cb59c97e26630a6f869af9/fivinerudamewus.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/9904660749.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/29094941092.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xebasine.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/54588251576.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/lobigelo.pdfIn PDF document text
    • http://alptw.com/images/files/13769039748.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/kugimakolowozuxix.pdfIn PDF document text
    • https://birudongker.com/contents/files/48176092583.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/52622291166.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/99844870564.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/saluvikasinuzavetufelep.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/48083939449.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/81996142734.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/66624433039.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/31889161108.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/46038568381.pdfIn PDF document text
    • https://nomortiga.com/contents/files/sigopamaguxevivozugubufid.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4af84df5---25506930860.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/ridozu.pdfIn PDF document text
    • http://sjanzee.nl/file/fiveniwexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=among+us+free+apkPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16460 bytes
SHA-256: e108eeb65ae194751f29abdabbd804739ab5d7e7a6af94ba8ba317c9060ec4f8
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 10636 bytes
SHA-256: 08fdb73d3a07a13bbb99c47534fef5a5ffa3cce2a4f58da3434a4557e3d97986

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