Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf9c4cf586fb5e3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 08:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd4208fee67339e3f70a3dc2ae7acd39 SHA-1: 9bc085af17367f7fb059fa7496add117abe4a6cb SHA-256: fbf9c4cf586fb5e37f158e04fcc132a2e40a5834f6554e532e2d6dd5473f8030
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 maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=saiyan+champion+z+warriors+mod+apk PDF link annotation
    • http://kapsalonvogue.nl/files/file/kikej.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164d158de6---kutafosesab.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/lokejavewitiwe.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/23076563271.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kusor.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/vexijanivefiwirivojuzufa.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/xakenato.pdfIn PDF document text
    • http://smirna.pl/files/file/gulunugabumolimeroroju.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/80040784734.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210902142311_vmdngo.pdfIn PDF document text
    • http://foxadv.net/file/zonazididokigu.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/40968425804.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/82504044582.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/jirobokab.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/6471658546.pdfIn PDF document text
    • https://matratva.in/userfiles/file/fujarufofewuvuw.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/xokotolegizekopaguvuma.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/41036703506.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/29991514253.pdfIn PDF document text
    • https://slide-bearing.com/d/files/83452790895.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/96504093902.pdfIn PDF document text
    • http://nktrading.qa/file/files/17328844755.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/56619893529.pdfIn PDF document text
    • https://sadex.pl/fck/file/fujedavegedoluxopiduma.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/4018726741.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/23725883126.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_off0000b183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 10932 bytes
SHA-256: 5abe94ecb9b60ab4653fa7e9785f47a38214a0deea04974ba992ba77f1b3ead5
font_02_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 15912 bytes
SHA-256: 64d8d6c4bf306baba0f46832eb478498148379cdcb06722a8a3d74867175cbe1