Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ca88e66a74926…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 16:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 670acaa96ca6548237f63b5f06e9aee4 SHA-1: 6318b1e933506a6aeb448596db53b83e8c1e7248 SHA-256: d45ca88e66a7492667cd87b646dc6c573b65b1a68264a1f08408fc2404abe061
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. While no scripts were explicitly extracted, the presence of multiple external URIs and the ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.q-jin.ne.jp/ckfinder/userfiles/files/gosakanogopug.pdf In PDF document text
    • https://mccartha-cobb.com/userfiles/files/66380295813.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2e862e5d5f12a9751f75a7bd04b9e654/jofixepanem.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/83945014613.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/79887012243.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/lidazabifoguvugugofusa.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/forebos.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sasefuxosadasi.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/rufibixoregesu.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/mavefiporitigirezaw.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/koboxugejasa.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/jedipazusimopakasapanuli.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/43042792721.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bavunuvogutisizope.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/23974650594.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/64900798916.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/demadimojetiduzosesekubaz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3f25f2286---13214650171.pdfIn PDF document text
    • http://bndweb.nl/upload/files/dekakevegirubidoximevalov.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/rekif.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613685c405d24---22899607188.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xifumuzarajagiposawuw.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/madokijodagibudumoxokub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pacify+download+for+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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 14312 bytes
SHA-256: 93cfe9c68ef65aad301333bff57d27433c1c071aa7fe171c13b9d9702ca011ad
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10272 bytes
SHA-256: 432e7be66e94a081434e455a01f21cf53748e6adc7ce055dc3805d0a132348ff