Malicious PDF — malware analysis report

Static analysis result for SHA-256 de405ad1d8340909…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 02:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 982ac772343f155ef8594317014728f6 SHA-1: 403e02446c0dd06f236575e6a109a1fd5b6a1bf3 SHA-256: de405ad1d8340909f06f0e1dadf0a6f675345e76b258a3c38d5898dd8b094e2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are part of link farms hosted on disposable domains, suggesting a phishing campaign. The PDF structure and embedded content are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=android+tv+raspberry+pi+2 PDF link annotation
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/57052255529.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/43158581836.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sezonomediputozimose.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/dosodujupabolutalesod.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sabiposipute.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jamudipon.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/nilomowemumivojaxitese.pdfIn PDF document text
    • http://goldmustang.ru/files/files/99053266784.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jekugaz.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/2826929494.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109190931487875.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090421031673499.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/lekesegemuvex.pdfIn PDF document text
    • https://tuinvandecruys.be/file/kutewar.pdfIn PDF document text
    • https://12shio4.com/contents/files/wujikilusavizadonovisuma.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210923_55261E39704EE569.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/38202555791.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/24649343067.pdfIn PDF document text
    • http://yanartextil.com/firma/files/fokowekinudelanagaketizob.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jlgrvvr3u98dus83pdpfe64sre/rinete.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/gilaluwopatesamamugipej.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/11171561909.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/popag.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/81731258580.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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 10760 bytes
SHA-256: 31e978212ee7392beaa782c4f4c7730791febdac586a012f88905ffdbf4588e4
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16960 bytes
SHA-256: 9a03e0dbe9d51bf291362854bcfbc7921bb9f868bb9be50f4ec0467b81fb2c2d

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