Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fd76d15b276741…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 07:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a80815029591b8d7ff3994781b28999 SHA-1: 9c697e816b89f83c99ef831526466c802cf4218d SHA-256: b8fd76d15b276741786849893533286ddca46c7aa160afaaff6c52efaa4a3218
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 embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://xn----7sbndn5at.xn--p1ai/uploads/files/gozaba.pdf In PDF document text
    • http://ztkammer.at/uploads/file/ferifubaxedofo.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/gevune.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e526c543---bafuxuxefidatalad.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/73588654736.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/19821621004.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/57571689717.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/2744316696.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/wegowoger.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rolajadoroli.pdfIn PDF document text
    • https://labelmarket.pl/data/file/gosigawuburalavosuralum.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/34666369779.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/51916251812.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/93125100454.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109041659008907751hvw69.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nulorewo.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/93546792775.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zoxibolim.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109091234135436.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/69972087352.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/veponelajizufokonifuweg.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tedidurumolu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4e2shehn9b2es547ns5n315usq/dibawefatevexomosija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gran+torino+full+movie+unblockedPDF 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_off0000c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 10904 bytes
SHA-256: bd1364f755ae45988d25d910cf5e35d4516bc17af290694e331e96b8e4e60187
font_02_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 16940 bytes
SHA-256: 69f7a13c5afea87abc35020862f5d92a46c546756cc9c265da0f0cea90626004