Malicious PDF — malware analysis report

Static analysis result for SHA-256 1163642a3e5abd88…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18872635030d8ae74951155c19d479a3 SHA-1: e431fe67f9ffaef1bcebac9d8344135e2c64ca23 SHA-256: 1163642a3e5abd8857a1c3d281afb7a7cbe2ceac90d4befd935c054bb149249e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://electriccityusa.com/images/fck_uploads/file/basefe.pdf In PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/sekewifuzutivakito.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210909195030.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/zapasepidonale.pdfIn PDF document text
    • https://angkagenap.com/contents/files/nudeselabixoripedo.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902233246606093i7j76su8pkto.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/40420026640.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kuvuduxetereb.pdfIn PDF document text
    • https://unitjaya.com/contents/files/nomabemej.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/66249791985.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jiferovekale.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b4e4046---60163643411.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/54408982627.pdfIn PDF document text
    • http://arucax.am/user_images/file/musenenama.pdfIn PDF document text
    • http://186086.com/upload/files/7340478955.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rojogiminapobanuro.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/47862259134.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/4541017377.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/25524933383.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/40538272729.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/59527454707.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4pehm5m0gefq2mso9gerfv2s9c/bugase.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/sajezadigixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=popular+mobile+phone+operating+systemPDF 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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 15712 bytes
SHA-256: d259c221cfd31dd7be7bd6b58b4411053316d24c45cda46d0f43d408a576f7ab
font_02_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11052 bytes
SHA-256: 413c2e239e493c71e59baec13a4e950e531c297dac50c4db2031e0879d251152