Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4e33b490c8daca…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 14:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fae6fc3946ba5c48c0ab247efbeb60f4 SHA-1: e8b2ab477699596c82c9dc31a8865f73cda5b6d7 SHA-256: fd4e33b490c8daca7ae42107b45c4384180c42a3f5d3a44432d9dcc5fef094b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings indicate it's likely a lure, potentially exploiting a vulnerability or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://gsprojekt.eu/userfiles/files/65114141572.pdf In PDF document text
    • http://crabandclaw.com/uploads/files/67218539404.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/28701398236.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/033fad152fe42d6e444ba16eab2b152b/wesedovidukawaw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae798b2985---78950855265.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/zanusamepoxa.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/13885289500.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/xobuwetabiwomidona.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/95222774522.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nuvalipopiwumikuri.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0245565001631085815.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kuzodidexepuwog.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/75472772993.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/tiwefa.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/nivorazivonukixonawubodin.pdfIn PDF document text
    • http://juentai.com/userfiles/files/pamufavimumoketuvuxisese.pdfIn PDF document text
    • http://egitara.com/upfiles/files/26001862564.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/59064954799.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kejij.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/gemidate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=websites+to+watch+premier+league+freePDF 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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 16516 bytes
SHA-256: 05afc4417f7e7cff61d2b4f1308f0369e9f08009e8434ddb2568a3860decb624
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11144 bytes
SHA-256: 202aedd727a1270cc2d3cab480b43355336a0f8e45753c7322126d17ec3f0d5c

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