Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6af584634ebe3c0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 12:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6757fb96ef1e130bf35e2919590d5254 SHA-1: bdefbd0233d8876726e218ed14722aa1f2ba3b66 SHA-256: e6af584634ebe3c0dc9e113cb8658d97980294f4c620163c07467127b66a6145
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=pes+2019+pro+evolution+soccer+android PDF link annotation
    • http://hrzservices.com/uploadfiles/file/wewip.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/vogogudugoku.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vitepuraj.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/46e1d2c8a13ff0fd75a666127c326141/54426854694.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/mogovonumukowanudebo.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/talebavir.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/mijojixepowilexuxebab.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/977a87c577a1149d32e504fea1b08062/kezudomutepane.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423e9070df9---19087298390.pdfPDF link annotation
    • http://shriramashramssschool.org/userfiles/file/rowufikagesado.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/javisalizopupenedazana.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/79384854308.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vedubukivuvodopipoxovuta.pdfIn PDF document text
    • https://pokereshop.cz/data/file/34864114127.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/fewofozitegaka.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/91863668378.pdfIn PDF document text
    • http://alkanboya.com/files/file///rawaliremo.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/pivikizinenupubotu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/26909718930.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/42831038233.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vezujideximobar.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/47142560890.pdfIn PDF document text
    • http://parfumland.sk/upl/jenuxodezenofonuvi.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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16620 bytes
SHA-256: 7d75f8e69aeeca8a2206d5787a562343fc93e532ccbbe817159ace151aca5378
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11136 bytes
SHA-256: 967cc7ef99f270ec930bd633ebb65ae3f3cc8c2062aebf15acc9e57e46b94181