Malicious PDF — malware analysis report

Static analysis result for SHA-256 442cce8d55cd8fac…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46f97d120e51572b76c689e8092afe72 SHA-1: 534338531ec32bfc79448d0d28592d953706140e SHA-256: 442cce8d55cd8facda16b8a826444f59e32b1ff5acf2df99d425b33306ccabea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users through a chain of links, likely leading to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alice-immo.com/userfiles/file/zusolijerodetafuvefowaz.pdf In PDF document text
    • https://ibeguiristain.com/userfiles/files/nituragakaxe.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/20862348692.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/gojateniliz.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/kosodulunuxi.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/46968802665.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091206030812.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/4310432590.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/2957165963.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pojikilesitifoso.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/153173603.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/jixiliwase.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/23956812250.pdfIn PDF document text
    • http://lecostationery.com/files/file/42470991539.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/gosavijatu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/34966073268.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/0059456102.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b177d11a---94836226459.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rakate.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/wivaxi.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/58665838579.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210906150939.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/3917318869.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/velokemisolebevuwoduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=video+call+recording+videoPDF 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_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 17152 bytes
SHA-256: fc1606127a54db6d37babf48031a04108f851094664d6a9cd85effd8cc35f336
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10316 bytes
SHA-256: bb0000f3fa4770cfec0a5bc40e317af936b9b5ce72f84ef9cb1232a447fe777c