Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a8186cf0d0838e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 02:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b3648cb82b7f990b7c5bf35f97fb2af SHA-1: dc7b19752b964646692e5a5ca972e30ef255ffe4 SHA-256: 64a8186cf0d0838e2c02d0f8eceaf9b69cfd666a7c20d8003d422a9e7d599875
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gemma.lucien-sv.info/uploads/files/6144de386a48e.pdf In PDF document text
    • http://speckletrack.com/update/editor/file/70941487740.pdfIn PDF document text
    • https://palet-school.com/files/files/79536908831.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/kivotelixoj.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/81491054965.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/65431297836.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/65303966445.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/litudagorig.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/47089359897.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/37870645061.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/tofazujufoxawefiz.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/xetexudexaxupeze.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/12653729312.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/penenibuguvifezewof.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/41974440508.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/73919635675.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/89694488477.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109141351336901.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/fesisazoxufer.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/tagarixuvaj.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/mudofanaxozulitigona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+84+a+composite+numberPDF 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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 16792 bytes
SHA-256: 569d00ff0a9777563d7bb53d07903694b14886292addaa2d8546f2464edf43ab
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10968 bytes
SHA-256: 964c69ed61ca0446e265d8f68b799f7b988bac6b728760ffaaccfcaa6d5c4967

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