Malicious PDF — malware analysis report

Static analysis result for SHA-256 f569c370f5627ba0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e2d5212006960f14dd763af87cd53dd SHA-1: 0284dbd7383f143bf4ddd11c72ef07e47bc9b963 SHA-256: f569c370f5627ba019c17c398a220429e37fdc11a3a3610173d59085a9326d72
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=beyblade+vex+lucius+qr+code PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece20e65ea---73449287817.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/73782497767.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jogimenozokelezigito.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/dixosomalitulixi.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/japeboled.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekavupirezabikorimir.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/34365306962.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/45259497127.pdfIn PDF document text
    • https://medpressa.ru/files/file/relidaj.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/62017430167.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/refizelazaf.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/17092811225.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/11563920783.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/nefaruduniwexodanepano.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/29158069686.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/1364692693.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dd2300a5177367cffdb3851ad0011e43/812840106.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/22964627306.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/84571767811.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/24599293031.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/vepiruzupisasi.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/piruw.pdfIn PDF document text
    • https://agermag.ro/mm/file/26905118079.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sumozarikafakavu.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 10884 bytes
SHA-256: c3948a49b6b5b5deba697631d8eecec3ca3c63f601a8c6c70518ff98072490d8
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 18000 bytes
SHA-256: 55bc70f8f37f9a60558cecef2a7fe5e060a5a0331aa711a6981deef90916178a
font_02_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1