Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd31cd149945ad20…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 14:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70a1ef36045861c736ddbeef37c2ac78 SHA-1: 1063ff52c18a76a1a0351b050e22c6720b6cf229 SHA-256: dd31cd149945ad202cb6c25d8ebeef1e9196ec015d8de293e644bc6bf3807e4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://isspskola.lv/userfiles/files/96423687573.pdf In PDF document text
    • https://ekoelprom.pl/public/images/editor/file/salusukumokerukezeb.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fetofebedor.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/82614156161.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/20271309624.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kufazogawerabukekab.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/lobopegir.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/75127047192.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/30737542903.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/90344201628.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/kasirabobalupusubude.pdfIn PDF document text
    • http://saint-party.com/media/file/6074651285.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80099110446.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/wezibokotarixejuwad.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/68097694135.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3597be01a3e53d8de0e718f5755c58fe/33825733776.pdfIn PDF document text
    • http://tzsunup.com/upload/vevunoginevojomedimideloz.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/gumamimazomeledezanen.pdfIn PDF document text
    • https://ags-car.com/upload/files/repufogutu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4c83c2e81de46343afb5bc7b174fa68d/kafoxajojana.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/dovevozozuluzapixifi.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/rozomisoku.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/12999927336.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/55634067402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=boxhead+bounty+hunter+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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 16728 bytes
SHA-256: 4b5ca10512439eb3899e3831c506740417d09eb785fdd3e4ced162be186a8f56
font_01_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10808 bytes
SHA-256: 38322a7004a1bc8bb414d19c6506f2cc02f7da38545d42eecd311e2da0de4c01