Malicious PDF — malware analysis report

Static analysis result for SHA-256 75404e55d9bcc510…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71075505587be92bec08f0a341a9c2ff SHA-1: 94339b503c4cfa76779b04284846c832cc150675 SHA-256: 75404e55d9bcc5107854a10604e4235f02b8f394aecd66403a8e3bbdecfe44ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded JavaScript suggests an active component designed to execute malicious code or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://irlanc.ru/uplcv?utm_term=the+forever+purge+on+hbo PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/70064700814.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/goduvabise.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/36678887459.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/94494161184.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/bamumubapijitix.pdfIn PDF document text
    • http://bjjiffy.com/upload/51228178455.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/45308344428.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/62479584654.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/85600599108.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/3287553383.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/84189654451.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/5695226744.pdfIn PDF document text
    • https://mauspro.net/upload/files/retozilokos.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/degumow.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/fizatomezejimapozi.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090118025270554.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/nilunapagu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52529161731.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/52234408056.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/35735067772.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408fe2e434b---12591487270.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416a9d3837a---69958153783.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gogowesolonerajufutumasez.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_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 20128 bytes
SHA-256: a52ef5691ce17ee6d6e2b7095bc9c7f12683c4db9358ffcb140a4351ad02a247
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 10340 bytes
SHA-256: 06ed088db97090d88fd13144f034879b02db29e0b76cc737c62801739fcce12f
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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