Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b639a747f330eb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 14:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 242474222d6b950f53164e268e222ba4 SHA-1: d11ab5b9390c4581576f028e39f7e7e9508add79 SHA-256: 51b639a747f330ebd5ed353dd9d270a994483d0da721598f97c112a5131e63f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://gcsiva.com/files/userfiles/file/wakataxuvabawagotulorid.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/42033626998.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/72514599475.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/gabetimuraritef.pdfIn PDF document text
    • https://tuinvandecruys.be/file/77136067550.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/dawojugajovoseke.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/75957380132.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/65229213619.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/34565413095.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/15767619702.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/walibinowemuxalujasugade.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/fuxodo.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/43641018867.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/54708367090.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae59e4603c---vuvetaxepow.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/89534982661.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/wafivulesomolizowamipuda.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/24440022309.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/xatekaxusexufej.pdfIn PDF document text
    • http://decorstore.eu/upload/file/witukopuxiwizimumedudop.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/zulabajabedilosori.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tikupigemuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lost+my+phone+icon+on+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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 18380 bytes
SHA-256: 69f3df797b529acd66a3063457232992380579f33e1cc5c1e329b63ca164ab46
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 10804 bytes
SHA-256: ae2ecf7f5329b1e9e3a723ff71bb35b735f2c622191b493ea1459257d16aea6c
font_02_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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