Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd77b349a96f047…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 02:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a47d8883ef8fded8ead5010ef294b19f SHA-1: dfcb7816d8e231f8eb66b1cf00806d231e69559b SHA-256: 5fd77b349a96f04733db358ab28a46f1a48bc8ce6c789d05d2bab71f4e9679cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=song+download+mp3+apk PDF link annotation
    • http://biosafety.biz/ckfinder/userfiles/files/rilevofekajer.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/55700249146.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/83775998401.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/7555202252.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/gewebenagaserafezinir.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-01/2db72785bb3b58154d2eae8bc024da2b.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/ligabixaremikesirero.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mogaxarazode.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bafin.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/gutigofunibaxotopudo.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32093290072.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/92048638816.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/5271980625.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/83609680957.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/2694871675.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kuweturirokesafamu.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalofonomip.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xerunazase.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fafod.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/sasizago.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/32471593184.pdfIn PDF document text
    • https://12shio3.com/contents/files/19191810201.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/35053816429.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/95261565364.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fifunojisozufopa.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/23487233082.pdfIn 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_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10572 bytes
SHA-256: 263e470a4280e9ab4aa2e02c160c2c90796361b21aaa75d1d3085a9aa0007e04
font_02_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 17612 bytes
SHA-256: b1eb8a7e60de4c24e56a4b2f679aa7c159b680657ecb703116a489744c9fd517

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