Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20a9a3769a07344…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 16:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77238797421320973f1b51631bd30db2 SHA-1: c98d2e9b3366db9a610fa4d164d7224731783d03 SHA-256: d20a9a3769a0734493b11b7eca3b58c4fe8c7d3bc33ecca54edb1c18cbc5a101
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://drafthe.ru/uplcv?utm_term=beautiful+words+with+r PDF link annotation
    • http://www.deopendeur.org/imgUser/file/80267894392.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/funamituwi.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65859656314.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kobavuwigiv.pdfIn PDF document text
    • https://wasael.com/userfiles/file/28182007643.pdfIn PDF document text
    • http://stevis.cz/files/file/1971393194.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/botigifesoxabodegutama.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/30956520605.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/66452421931.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/ritavilozaso.pdfIn PDF document text
    • http://husplaza.hu/editor_up/52130561622.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/3078120747.pdfIn PDF document text
    • https://primer-spb.ru/files/files/82982559276.pdfIn PDF document text
    • http://intertravel.hu/_user/file/vijalifun.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef8c01524---44525848826.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/53572431287.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nisedukenepifowa.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/85580572804.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lagevowezijifapiwujudutu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/75410078600.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/zajubilitaguxaxidukurode.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/63271716733.pdfIn PDF document text
    • 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 17200 bytes
SHA-256: cda62c5e512fa8885e9afdab2fe5a39689a4cd4f19763997d08fe826a0252820
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 10588 bytes
SHA-256: d14b2b97865722264c8b1986c847ec03057ca646ece62151707cbc3dda71907c

Open this report in the interactive analyzer, or submit your own file for analysis.