Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe88ff678abac7c7…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13fa18c7750003211af053dae60b5c0c SHA-1: 01a527ab7bc38564a7e7586c3bc6b39bc296bb27 SHA-256: fe88ff678abac7c7aa48fa69ef80032554a5c924ba8ef3a75bcb1ef839dab71d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on disposable hosting, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zjbfjt.com/upload/files/61580011615.pdf In PDF document text
    • https://agermag.ro/mm/file/26905118079.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/romefiwemuja.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91076854211.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/60550144557.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/36392937903.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/govenodazaxisezosokamu.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/18473198693.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/repivupitul.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/10/01/file/20211001_013456_177.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/99142328663.pdfIn PDF document text
    • https://network-italia.com/file/minubolowejulalavu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/17492183288.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/5474677531.pdfIn PDF document text
    • http://dalaichau.com/files/39975209997.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/34377051226.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/33785650594.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wufidimezu.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/dinorofejukanitinujarif.pdfIn PDF document text
    • http://pedraferro.com/files/files/vukatawuwudizirufikirojew.pdfIn PDF document text
    • http://gomail.vazoom.com/pictures/gaberokomomigugur.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/65657398053.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/28532922523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=marin+county+tax+collectorPDF 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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 10364 bytes
SHA-256: c9e9d50cb1190dd778a353a32e93065ed8c27b8b2b54d6c7f79f3a5453dde3f3
font_02_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16180 bytes
SHA-256: 7b52cc4a6062112c899ea8b0d885968b1c8369820e0c98acbb2227f9832c8610

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