Malicious PDF — malware analysis report

Static analysis result for SHA-256 514ab59f6f26a012…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 08:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 673d430fd61ca0a0da9c848d4aed6c59 SHA-1: f4eda4940b25f94d0efd030f4284f33fc8f82ff5 SHA-256: 514ab59f6f26a012265773c5f5028d80b42caf4d011da829864ab1cf0eeede7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous links to other PDF files hosted on disposable domains, likely to obscure the true malicious destination. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mosjob.ru/images/file/14826625122.pdf In PDF document text
    • https://manenshop.com/upload/files/51196534980.pdfIn PDF document text
    • https://cargotavio.ru/files/file/97297995577.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/58952523129.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/fagipuperuto.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/72369382914.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xilotobuwu.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/32411803548.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/52255096535.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/jufejitimoxumi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109112051038667.pdfIn PDF document text
    • https://12waktu.com/contents/files/sibafavu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0709542001631577832.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210918_9B6232E788627FD2.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/doparuzexikaxunepa.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109100103001469.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gapupalovamipikowes.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/minogasegefomawowowufazow.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4d62950785c8f71005647142b4c3ba41/43967784737.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zewinesixofodilumup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ardab+mutiyaran+movie+download+filmywapPDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10980 bytes
SHA-256: ad571c43b438cfa09652778c46b8cfcbc749725f69f154ca447e6e88b20f8d22
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 17692 bytes
SHA-256: 73b351faf6b326082e77fd71b26b07e8a6ba307be8fd8bd3a4ee685f6aabc903
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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