Malicious PDF — malware analysis report

Static analysis result for SHA-256 534635a25651f3c7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 06:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f840324c223ea0a88c10d6ef014796ec SHA-1: 2fb701d4f94c738c47c2ab542c8edc140f5e93aa SHA-256: 534635a25651f3c7fbf7a6b3b27a885db0d551f466d1ddc24ea5dc1eee4ba8e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3c2c5067---kekadikujapaxujaxaxif.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/82980435537.pdfIn PDF document text
    • https://goodline.by/userfiles/file/60688356867.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210914_065512.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nalakofiruvemixu.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/tikeboranolitewitek.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/2118361542.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb4857933---dowilakonefurorod.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/fesavabadotixov.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/27939014825.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/92940060543.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/85375756480.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/tibozowipepupasodugoxalis.pdfIn PDF document text
    • http://dasbluemchen.com/zokiro.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/6161093974.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/63591442146.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/rafezamegexeban.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/besamalasoretupejodigu.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/51216464246.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/kewatezozikejufidew.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vopebetitufupajab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+it+ok+to+lay+a+fridge+on+its+backPDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 17956 bytes
SHA-256: 8b7f9d9fb223049a453d8369164356905a9ecf0428a96ca1e6bab7815a93760d
font_01_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 10948 bytes
SHA-256: f8f9f32c65f4c8b201976ae2e78a3d4690e4778a9f239ab82676b9576984bef3
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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