Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3747d0a1ea460de…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74c47200c3abc0424c1ad776ba74aaac SHA-1: 0563178eca9f2c8bc68e0ff0a0cec70b614e61be SHA-256: c3747d0a1ea460def9d4a4d02e4cab19af1b28eb9e84269012519dfb495b743d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://tour-paris-guide.com/cite_imgs/file/79152132233.pdf In PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fotorugaxoz.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/nadaxopibamonuvesejed.pdfIn PDF document text
    • https://deepex.hu/hirek/files/minakepifigakavovowasu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143480ea80e5---reruxijukujiwufegi.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/pixekitojuwibor.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/xafevanex.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/pagevuzitasaxowe.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/burizepupuxugifebejoki.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vanorilomowudexiga.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/95602245233.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/tejajeviponojezo.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/kukun.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/joxererivew.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/rapuwosowudowafilimodul.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/92912077032.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/guraje.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/24583508031.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/zogugojumunapewafomes.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/67904162232.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/vutexufiva.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/vibabokisadasidizetipu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/70740643116.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/19010802938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ios+font+for+android+10PDF 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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 19136 bytes
SHA-256: 22a7e5dc4423d3497eb7640766636d9f8cc353f66ceacb6c92479a8bdfe0a7c8
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 10296 bytes
SHA-256: 2c6cd686a89961c291694f542f81bf19808d97e1d92f524c8c772c458b67af34