Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09cf3beaf92c1b0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 14:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 8f69a4d900068f6515c0c57e4848b6f7 SHA-1: a8b60e46f640df2393038166da449604b46e6c9f SHA-256: b09cf3beaf92c1b01c296e4babd0c4b07a38748fa1d25ca2aae42f2762147560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.allatpatikapecs.hu/images/file/jilokejitarasedagezivepi.pdf In PDF document text
    • http://parbatsamajjapan.com/img/files/files/gukotabujupakuxuzoj.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wodotase.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/81530987753.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/8901691597.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/35168729733.pdfIn PDF document text
    • https://partetesal.ir/data/file/73548396910.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81872219238.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/nejuradidifowoz.pdfIn PDF document text
    • https://jin-ji.com/upload/files/pelaxotexojoveli.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/84165208903.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gelisej.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bugire.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/68124461478.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/vufuverekuxenojomi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc5e47ed---43633452268.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/mikerepotafeg.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090519570714.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sujugusimopilabofu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/79438796732.pdfIn PDF document text
    • http://markone-tools.com/upload/files/99946021843.pdfIn PDF document text
    • https://alpinashop.bg/files/87786672054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=carbridge+for+android+autoPDF 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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 10584 bytes
SHA-256: a2bb4b070073efeee4388214118e3adf35ed1cd3fd612e04a37c3d7ffd799d07
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 17356 bytes
SHA-256: 0ca5e644a22edc2394629c8909a2ba3812b7b85ad00c6e9e5b30ee4e7fde65b9

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