Malicious PDF — malware analysis report

Static analysis result for SHA-256 5150ca49dc20c70b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80f5e79cfac78baba6a3699262550143 SHA-1: 97afe68e7745b4634915498c7c4a0a3ba6d429bf SHA-256: 5150ca49dc20c70b8c2309967a66c2ed0bd9f4e2680aa5d20ae371264b3ac12a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm or redirection service. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=playing+it+my+way+book+pdf PDF link annotation
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/53644216249.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/84001142923.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/16968725238.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/71415023650.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jaxoviza.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/82852028661.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d45b84f0a---faxiresimofob.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/96166526123.pdfIn PDF document text
    • https://lordoptika.hu/files/files/68457818525.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/fulawidezedejoxebifun.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/42025086946.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf65705080---pukijuvibadubitujibazube.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/81980997710.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/simezagemaguvipufebajo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/59139792710.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/funalizado.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/21033652802.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/negabiw.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/fosavuximu.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/forajosobazunasuzorofuwu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/72474902689.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 17480 bytes
SHA-256: 9f0a2099085b7d1e3eda9480754c922f651a98e8d9abb93498e8302701034336
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10876 bytes
SHA-256: 36301e2433922bcc98e398b64b579c8052ad6d4ca234dad60677d738b69f57d6
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1