Malicious PDF — malware analysis report

Static analysis result for SHA-256 c996c12a259f5050…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 03:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04637ff3f374785b8c76deb715376db8 SHA-1: f26dc8959d41118401c7855525cc4a7426ea1151 SHA-256: c996c12a259f5050273c6b0661d59f628d75f81bfc1ca4f44cd99f568b74ea2e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are linked to disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the download or redirection to a second-stage payload, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.groupe-coelho.fr/ckfinder/userfiles/files/13581854261.pdf
    • http://tw-echen.com/uploads/files/202109050436594858.pdf
    • http://meimagedance.tw/ufiles/files/dirudifakugerotevumob.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/91466434195.pdf
    • https://triosms.com/userfiles/file/lerur.pdf
    • https://totalsewa.com/userfiles/file/vitugoleroti.pdf
    • http://tinhdaurosa.com/Images_upload/files/rafukolesalaruvadekum.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/58150788833.pdf
    • http://www.andreapondika.cz/file/mavujim.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/98291283636.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/63002245314.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1258135710.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/42499172234.pdf
    • http://abworder.com/uploads/files/julojuzavenob.pdf
    • http://www.contal-farmer.com/uploads/files/79381270268.pdf
    • http://vom-ragnaroek.de/uploads/file/78266437286.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b5fc1b8515fae288a8da9c53e298ed58/71661892965.pdf
    • http://www.galiantsolutions.com/emailimages/file/xozoxopew.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/35432774976.pdf
    • http://doo-san.com/userfiles/file/20210906224552.pdf
    • http://vlajamo.cz/images/file/51614434020.pdf
    • http://metapolar.hu/tmp/zamunoto.pdf
    • http://agcslohian.com/userfiles/file/mametu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+apk+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c735.bin
65c3912e96b8ddcde508d9893f1a761004e68f9431f8ca55a1967586e16fca58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 10400 bytes
font_01_sfnt_off0000dedc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 16792 bytes
font_02_sfnt_off0000f6ee.bin
7ca30b8623866e057631d50f385578a7655e76e783d74ce13e3fd4b3510f0305		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16884 bytes

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