Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dea3eef304be03…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 14:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fb6f50340263d9115a0fd4318b90c43 SHA-1: 96e12d0b1140c96afbb54ede26461f9a01adca67 SHA-256: 05dea3eef304be033d0bfc63b99d776331b3ad1b8db26364aaa14a711ff45f98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=s1+english+exercise+pdf PDF link annotation
    • http://airfa.it/userfiles/file/44224859849.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rabobe.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902203900227.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73885479818.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/96197347597.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909073045999196.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/livovem.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zadezepaj.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/sasanavefizirapegotewete.pdfIn PDF document text
    • http://hkalc.com/userfiles/81251246655.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/boxupowumikavamonilapa.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/17249275192.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/47584860945.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5163d5eff---33437511264.pdfIn PDF document text
    • http://knipia.com/userfiles/file/57199109788.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/94551226818.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/fidovowumigiwo.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/mimumavum.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/13402998428.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xukafuwifuwaritilofu.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/96120661799.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dedip.pdfIn PDF document text
    • http://c-six.it/userfiles/files/zijixitotapinorefi.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tanifamemexi.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/susotanese.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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 17268 bytes
SHA-256: 456e8988ec92e34ae606a56d3acf4cfc674194e90ba567f145b4484aba94d01a
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10748 bytes
SHA-256: ced17bc393d58bc8c79d85f53e802febb993ececa520110f936594e918fe08c3

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