Malicious PDF — malware analysis report

Static analysis result for SHA-256 235f386b732bb09d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 17:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3681406ca1029d612dcdaf51a2a4a0f SHA-1: 5a867e9820f5d31f496a5ecbba5233557f5b8ef1 SHA-256: 235f386b732bb09d162ea2a61e4cf1c7875b00a7bf1cd82669dc62cf8e49fde2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=best+android+phone+under+15000+in+india+2020 PDF link annotation
    • https://ooobelkom.ru/ckfinder/userfiles/files/11277720509.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/wulebu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8dc59a35---baxateniluvudo.pdfIn PDF document text
    • http://glassick.com/userfiles/file/duzilo.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/68621585401.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/vagugo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/2242400488.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/80654825487.pdfIn PDF document text
    • https://rintrans.com/files/97537485810.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/85195505872.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/menufezafopiwowokapo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tojokema.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/10056609275.pdfIn PDF document text
    • http://tochalco.com/uploads/files/79456442792.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dopajajibetotozilanafabed.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/pitisoledixeb.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/fovepususab.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/sokaluturoj.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/44451772391.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/18022255208.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/86694343286.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/28407594951.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/muzawugipodelolanid.pdfIn PDF document text
    • 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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 11024 bytes
SHA-256: bd5fbfe3a8a9100f1fc1c625cacd7a3c81911244b4549402f4bd6c0438bcb604
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 17036 bytes
SHA-256: f0a697bb08c084da1a228413ab634d8c0bbd42ac8cfb098002d2cabf6182bf2d

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