Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68586e5b7360abc…

MALICIOUS

PDF

97.3 KB Created: 2021-09-22 23:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ee037557c778e79baf371e604723643 SHA-1: 8c0c933a7fb565c5f65701a8b707d098fce818b3 SHA-256: b68586e5b7360abc0f8a2df147fc7c49eaace87493a1bef059981f74656e4ca8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. It exhibits characteristics of a credential harvesting lure, specifically targeting MFA or one-time codes. The document contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attempt.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/14163113529.pdf In PDF document text
    • https://csp-pub.com/stockages/files/38282898524.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/bafebojejazobagi.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/gosomasawaf.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/sogejazabobisefajikujuzub.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/38543267565.pdfIn PDF document text
    • http://zenithmetals.com/files/31156656276.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/95142824396.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zivepipujunumedemoxogizi.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/riforipudoxupujo.pdfIn PDF document text
    • http://signauction.net/userfiles/file/jenimonewagovupi.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/zepujajinakajolati.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/67452331508.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109030707145946.pdfIn PDF document text
    • https://tomas-music.com/contents/files/76404491959.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8a2840e454de24adab4255fc301e61f4/46930638781.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/84967718173.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pavugabuwanadojonam.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/zuwotuximiwagovus.pdfIn PDF document text
    • http://vina2002.com/uploads/files/zenubafutozip.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76beb59d4---15853459182.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/milewatobemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+sms+autofillPDF 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_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 18980 bytes
SHA-256: e823e5f7d66701a2f30b0ca999877572481087aea2463360083190126ba95b75
font_02_sfnt_off00015ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 10464 bytes
SHA-256: 4b9ff274fcaa1fd9a9eb4731b6da9826d15b1eb5d364d0a96d437dc13f14562a

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