Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baf773157cd894f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 21:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64aa1da122b681d8be0836ea07e258a1 SHA-1: 77de5b088a4751351ae1a2fbc640019b51450fe9 SHA-256: 5baf773157cd894f075779f50a1032397171d82b850ad6881d128c1872e7a56e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The presence of many unknown URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://artsar.pl/userfiles/file/pilofukexuxiwosofetoza.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/xinazil.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139539a096d0---pelifibarubajo.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_ECDB95F2590FB6D4.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xiloxegoxaxizip.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/fakinu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gazivazuxilusuvo.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/65667503163.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/nidodamudeganetilu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vojoliba.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mimajixaloz.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/90436887959.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/sijejorakubovafupujax.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/difijawesolo.pdfIn PDF document text
    • http://muszempilla.com/files/file/zufiwefidobiwolupob.pdfIn PDF document text
    • https://esvigo.com/upload/files/29458869903.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/12840115310.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/9330371836139a4b64555a.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/todugufofudetovovujowiva.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/18820766355.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///12656396464.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/35588663116.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/39855577849.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/31815334039.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/77436773480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+minecraft+latest+version+apk+freePDF 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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 16628 bytes
SHA-256: 637d7b374720c9c5c11c22f1d85e2be9f94db2cd59aa078c6e94ee3467848c9a
font_01_sfnt_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 11028 bytes
SHA-256: 3fa9b362e263bfc83ce3b8d9909550288209b9b0abd91592331d5d83fda9bbcf