Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8783013c9ff353…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff6fbd0727a0931166008ae3a68f3f2a SHA-1: 6cfc97d970f1ea8f13bcb84f6013428d5d8d0311 SHA-256: fe8783013c9ff353500219069f4c8b684d5cf1aceaa727465e4ce8f2a44993c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of SEO manipulation or distribution of further malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://andlupa.com/userfiles/file/82544977212.pdf In PDF document text
    • http://bhk-aindling.de/userfiles/files/37563687896.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9409dcec756fdc016a1839e830c7ed6/nuwunozunudirixokifet.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vinababi.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/57941082058.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/saxezigaxuduwimudosulif.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wofobu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sopilufuwor.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/554931554.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/2253475304.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kulabujix.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210901210321649.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/vodikusifopikufezupuboto.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nefakogedikewaga.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267da8b1f1---jazoxowonukiwupodi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/71743589103.pdfIn PDF document text
    • http://medrea.ru/upload/files/pewagipujapexo.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/figojaxixabufikakisugib.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/28302496090.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kanejiwimatel.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/rixizopuzoja.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/pirijurol.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/13598819152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=give+examples+of+an+application+softwarePDF 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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 17276 bytes
SHA-256: b5f840681fcd2b2d187bb4919d37774ffdd25e854a8b06bd63de68f4026f8828
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 10932 bytes
SHA-256: 2a71abaf01ce3c4db97a4c58ea1eff5fc9a7e806f1bd583ab551f1a525df9915

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