Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef00c50bf086fa9…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 18:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5bb2874c01305966f78e803a4cce5664 SHA-1: 024e0ed448d56d0516fdd08c636af38d82f2acf1 SHA-256: bef00c50bf086fa97493b82f5a6a2671bcb4952df6ebb32baaa4b4d5a414e47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=mini+militia+apk+2020 PDF link annotation
    • http://mastrodibaglio.it/userfiles/files/40917031486.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/xebiluzigaradewu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/wifuwuratukiketukiji.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/17792518681.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4bbd91c4b83ad6ba1551a4fe291ae4bf/52642196074.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/tijozubunepilejijud.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/23822749200.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/bibemek.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/98530371568.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/jitugibapuwe.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/40175466021.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rixizaxerugove.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/12560197689.pdfIn PDF document text
    • http://langyupharm.com/upload/files/59816680522.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/34695868428.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/likezamukinupiwovexigav.pdfIn PDF document text
    • https://rintrans.com/files/giredu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/sipabovowixodakegetujita.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/90581529868.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/48756466292.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/rabudet.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kodomesejebifeloxe.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/tawumovebolamekoxoderoba.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_off0000adf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF4 14532 bytes
SHA-256: c7ddd39a33bb64cff098918a10eebcd19387048cd47206b88fbf8a119696ed28
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 10220 bytes
SHA-256: 400abb41e822ba6321b73a28600033ab07e763c6646917fa8c9c73c769b1dec9
font_02_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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