Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ba15156d06a7f0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 14:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b20b1fc630dabf231fd935d4950689b2 SHA-1: 7bc9f295a4c61fada8fc6cdaf4481d67cf2f9038 SHA-256: a8ba15156d06a7f013340c8b4b9bda027daa5c68165db68c7b23b352e8fdebd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://weekendtripskolkata.com/userfiles/file/37251200269.pdf In PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nawufomowufebafutiga.pdfIn PDF document text
    • http://www.toptehnik.si/images/tenomazanawoxaper.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/87120802496.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/42272185621.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/5089284976.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/39384036080.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/62540602355.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jugiv.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/rotuman.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • https://kaparatt.com/images/File/wesefopaderegatuk.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/kenevomigomuza.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/wirizededudugejotasaw.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/91339563231.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913024648.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/3609771538.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6856205876.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tajezolusozakumagajugez.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zofanupevisagolavakibe.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/ziwowutedufufogewofawe.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bakadutugatutoxofifotab.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=angular+component+uiPDF 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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 10632 bytes
SHA-256: a3c2a4a59ac9e94d518160406cb3f0865a0314b6cdb138b054248e44d2244c41
font_01_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 15568 bytes
SHA-256: ff98ca2a14fb858a0f0a9d702ae626c2c83ebae84d56a5a43f71d3ae5e169423
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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