Malicious PDF — malware analysis report

Static analysis result for SHA-256 8552083dad30d10a…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 98417d0dac054badbe385403d94e94f4 SHA-1: 70b3f447c5ed7d4e8e8d8b648c2af906a93ece2b SHA-256: 8552083dad30d10a90f5307d43d7ad127cbce9f57a6dcb15355a206babe8a9ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://herningbadintra.dk/app/webroot/upload/files/51948290488.pdf In PDF document text
    • http://cissi.it/userfiles/files/87217849603.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8chfff7idl33g9nrp4pd7t895i/16958987089.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zofawokuwefig.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/zovikenamafilepimolisug.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210918_27047541EC0123D9.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/ribixozojikuwigezaxik.pdfIn PDF document text
    • http://rockyhotelsgroup.com/uploaded/files/metisadawelivig.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/83726445186.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/19164085249.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/44831788899.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/bepetuvepakogubegomilo.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/kudedekememejevuxotaxotex.pdfIn PDF document text
    • http://maksimetall.ru/files/vikojidajoxiwe.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/89619043130.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/vatonedovawepijojetutakeg.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/31773535346.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/goxotaredig.pdfIn PDF document text
    • http://sb-78.ru/files/file/joziwosozebobekif.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/bumixijududof.pdfIn PDF document text
    • http://crediramasrl.it/public/file/4992796635.pdfIn PDF document text
    • http://gr-chem.com/upload/files/79026300158.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/magazozerubibamed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+tell+if+a+snake+is+poisonous+by+its+skinPDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 15108 bytes
SHA-256: 18850f903432e7a0cc1a19f2f79812b42fd09083a551750fdd1bca61e93304b2
font_02_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10776 bytes
SHA-256: 0696cac8f2f3ca93ed95daded736066ba1a2231c9ced64ddc9cd9da26192e10d