Malicious PDF — malware analysis report

Static analysis result for SHA-256 8416a6431b8311a1…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 07:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d95053a8fda9847e2662c57d20599bd SHA-1: abfb0791ceaed95cb1b48f52c7ee0638bd3fa483 SHA-256: 8416a6431b8311a19a63dc638f0f230715eed261be3adf8fc1c9d4e22c93543e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm designed to redirect users. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely using a lure like 'free xbox codes'. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.zywawiara.pl/pliki/6446478384.pdf In PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/31575326752.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/62019623687.pdfIn PDF document text
    • http://semanbio.com/upload/files/81317540497.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luworu.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/85736940866.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/42808344061324138a24c6.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xefulumuredavotuwosuf.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/90598248532.pdfIn PDF document text
    • https://plasy.com/uploads/file/pipaz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140139d646e0---11715642404.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zokiziradadevunajepipuw.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zemajevo.pdfIn PDF document text
    • https://majubesar.com/contents/files/38656674514.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090521045962.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/kaverafoxufifewigobetidef.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/36239926589.pdfIn PDF document text
    • https://majubesar.net/contents/files/wimowezalefubama.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kisuzezaluvugujitaxisoxuz.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/69418471643.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/zuzeropugajixawisawar.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bulafipujipopipuvediluwuf.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/paradekutom.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/zamazodazuzavawabiduze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+xbox+codes+not+used+2021PDF 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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 17336 bytes
SHA-256: c6899af0bf41b74fb298358c4d41a2827d0bfc23bab1bef79120a75d5c0a35b1
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10676 bytes
SHA-256: 727af94e4b4c1ffc78c6e25538467b66d5d9441c03ed94834b8a19a3ecfd96e9