Malicious PDF — malware analysis report

Static analysis result for SHA-256 332e8abc1850c8b1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 20:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1934fbc99dc07deb9c9a7b26eb288cd9 SHA-1: 2b8aecca6fbd9559dd8b1a7c4c01645b7ee29efa SHA-256: 332e8abc1850c8b142e6f3d9873d35767d3fa2af15a8db8843005484424a77d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or SEO-poisoning campaign. The embedded URLs point to various domains hosting PDF files, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiopol.it/userfiles/files/vodubebinojabum.pdf In PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gidirutadowaxorinujebut.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/ziraju.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kejupufokupoxumir.pdfIn PDF document text
    • http://pb-book.com/user_file/file/48792503665.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/37092466205.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/42869481260.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ffa1d11a---41511893253.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/mowaxokileniberu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zetatezif.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/82892421269.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/nasemivejifagenivoxununu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/17387286595.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/zedeso.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/25257737978.pdfIn PDF document text
    • http://artediapharma.com/upload/files/14190944200.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/33094616479.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/basavekatinumubixusaf.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lavamojavosepovu.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/22623935581.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/32956268983.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/gubegeniwat.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/vepujavexenepeko.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/1625268129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ps4+on+android+downloadPDF 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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 10176 bytes
SHA-256: f88554bf1a5fb40822c87386af3f8eea81bd50f3b12ffd0fb441b2e486b97dba
font_02_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 14700 bytes
SHA-256: 5491bd67da2f1ff22550abe5e05cbcda5b90aa8b02ac465846023ff90b7d9968