Malicious PDF — malware analysis report

Static analysis result for SHA-256 69def709f8cd2548…

MALICIOUS

PDF

89.8 KB Created: 2021-09-14 05:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0d230aa5640c3d71cb36c6b46348ebc SHA-1: f9bfb893211ce6174faa93a0300b61c31429fc46 SHA-256: 69def709f8cd25483a249648640a10150d64c15041421c0d46333b5fd4e0da83
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to host numerous links on disposable domains, likely for SEO poisoning or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tawalamuwonujazaj.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/xigidipuv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8c1c4500---zupen.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tezusonilovizulesezaj.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/85231660956.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/8258502587.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/6346864304.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/paxavomovopobuwa.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/zofufivapebuzomidur.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42859980179.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38053801178.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/baxesibizomunoteri.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/69108878114.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/megutarodelufufusaz.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613b87e235b84---gawowanasetezopufijub.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/41869593020.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6136e73c4b7b2.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/wetedemozededijer.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/76924145543.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/tebav.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zoregezibevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chill+music+roblox+idPDF 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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10512 bytes
SHA-256: c8794cff07e3731a87dbea4b0dba37b719e22d53a4472b5e003cbdbe7b81773c
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 21588 bytes
SHA-256: 472bf5220f0227161738727b4547d811de5a0e747a57fee4209055f4864f79d0

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