Malicious PDF — malware analysis report

Static analysis result for SHA-256 7541309fe42885b8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 22:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1be989cc6046df13e4c11c2ac9926333 SHA-1: 4470cec4b281ef8b0c28fc4f22b845d54a47d1e4 SHA-256: 7541309fe42885b8daa13eb02bea863ea35150ada9dbd62bd1966f1ccc5ea259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lescourailleurs.com/upload/editor/file/gadazawotijota.pdf In PDF document text
    • http://news-hk.net/uploadfile/file///fuzofapazebetufusekiti.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/98862427918.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/51802299137.pdfIn PDF document text
    • https://msiutilities.net/documents/49949120214.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/86801392444.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/81067255477.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109081644474198.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/31470308374.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/97099783710.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pilomawesexuxoxep.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/62074796445.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/97518193488.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/46904953300.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16131c627a65b2---29188125895.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/17115486633.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93520923079.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161339480a208b---wekolefozumunizebar.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lebopuxab.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/35934851926.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tedavikunagepapunux.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/51820200341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=srt+justice+leaguePDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 18244 bytes
SHA-256: cd5a2d653537aa318ebe106799428f4ce0abff3b1da6a470b3794c8507933295
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10488 bytes
SHA-256: 8912d26beeaee3a8238edb4db7b6b77dc7cf559dea492097c837a51f16a7bc24