Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf48ebc22f8374f6…

MALICIOUS

PDF

89.5 KB Created: 2021-09-14 03:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33a913c3e9446821fa1a81d850b24726 SHA-1: 614665801577287e206d668ac83983dd25d5625a SHA-256: bf48ebc22f8374f64f5984a84da24b41c2211e3d1cd8f68ed8cc17aec58fee5b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The presence of numerous external links, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://peoplefoster.com/pliki/telukajibowipolox.pdf In PDF document text
    • https://samajsutra.com/userfiles/files/zutelowulasu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5935725766.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/towilesujuwubumakonad.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_071612.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/polabasuvekikidibulup.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/69139594933.pdfIn PDF document text
    • https://eklyps.net/images/file/87127389798.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/60947325380.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/barinuvixosepemo.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gezamo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/94145879347.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vumoxulegaladijatevilusa.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/sanuki.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334f2a0188f---98600975091.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/dalemekugereduzavuwofek.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/8677150916.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vobiribudaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=clipboard+app+androidPDF 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_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 18052 bytes
SHA-256: decec64dedf5b5e8d5c73cc961796a2fc23ec50e2775f7b9dbb7f8fc4c87465f
font_01_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 10160 bytes
SHA-256: d0137cdb58a584999d7bf193b29be80680dd4945a61b696f67f05687ade5c3cb
font_02_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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