Malicious PDF — malware analysis report

Static analysis result for SHA-256 81977ebca0ba683d…

MALICIOUS

PDF

78.7 KB Created: 2021-10-06 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc44943cd173db567f0529203c4542d6 SHA-1: 290d74a5a45d87a6be53aeb3b2cd890bff4c9527 SHA-256: 81977ebca0ba683dce1ff0bd15296722342f76db4bca84f779dd4d2d5b4f4a13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=rough+country+installation+manual PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135151f7e91d---sovadigivaretuwuxupuxupij.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/23843603852.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/58191111524.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/mafutoxupado.pdfIn PDF document text
    • https://paperland.bg/uploads/file/soketuxogubonaxo.pdfIn PDF document text
    • http://kes.org/upload/editor/files/bizaxefewinane.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/41405743722.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/negex.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/87921348321.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/12303479117.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615ccc5426c0b---lutono.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/66574024911.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/31470307543.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/61882428518.pdfIn PDF document text
    • http://ban-dong-ban-mat.theonejsc.com/userfiles/file/67912717297.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jamojiwovajoxajebiva.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/jinidurelejukowow.pdfIn PDF document text
    • http://thedreams.cz/files/16159873051.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/pupuropokonenubulufaf.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/mazodutufeza.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/68371181456.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vovujotobegefepixubigugu.pdfIn PDF document text
    • https://dm288.com/slicice/file/36516532950.pdfIn PDF document text
    • https://managed.jlcomputers.com/home/davesmooIn PDF document text
    • 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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 10804 bytes
SHA-256: d7ac8fd73f213a3db89c737cf5edc2d9cfd6e942ccc7435897ad315c54df123c
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 18128 bytes
SHA-256: 0a3929d31f81f2713738f53955382a04a2ebfe498a11e8649d97305ecee33eaa

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