Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ae97936513f945…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 02:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 554022591b0c2698c042b94354d7dea7 SHA-1: 071cba6c101bde1c5c9244d56786e5ea0cb1b2af SHA-256: 80ae97936513f945b000fed3d0d0ada730c3d076a278d13525ef1735213b4ea0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or distribution mechanism for malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://belniig.by/public/file/wuvit.pdf In PDF document text
    • http://geometramaurotozzi.it/userfiles/files/54535703732.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c74e45f0---85637310725.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/96538451778.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/kuxoxabidirejunujupeku.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/zagipiganokuzijo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161350b9715cae---62350847742.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/25786543171.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/pagopupabo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/taziwenogatoxazoto.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/54267629055.pdfIn PDF document text
    • http://spharma.ua/files/file/73776494085.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/jojixusaxigigix.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8388242226.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vabobarubi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/40106044959.pdfIn PDF document text
    • http://julianina.dk/upload/file/pulikunesivo.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210909_69622BA7B7F44EF7.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xuwop.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6069461473.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/50991445883.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/66787791276.pdfIn PDF document text
    • https://baglab.pl/galeria/file/7245310051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mha+live+action+moviePDF 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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 21860 bytes
SHA-256: 9cb1cfd706c98a2b58b9fc9276d30b2606c51f39f10248b6f23b23463c51444e
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 10288 bytes
SHA-256: afec0e87d43e9ab7f87e6d8cdabd8fea74533994c09087a8fdd8f42e573fd921
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1