Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddca328f26a1837a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 10:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c328dbb416350a3b14acf1bd78a405a3 SHA-1: 5c3aaaf50d653f65acff40927a4eb8dcc3057be4 SHA-256: ddca328f26a1837abf2db12abef2cb3fac2eca9d5da730fd8ac1dc50fa7592bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of multiple embedded URLs pointing to various PDF files suggests an attempt to distribute or obscure malicious content. While no scripts were directly extracted, the nature of the link farm and the PDF format itself often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://confidence-ist.mktechsol.com/ckfinder/userfiles/files/70868481187.pdf In PDF document text
    • http://chipgene.com/image/files/20210909_105910.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/63192740978.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/regigawavubupuzewebixapi.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/30543783593.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/68624056406.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/jurotiw.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/69913618795.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/lofixitudapuxatil.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/92157668418.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/62597335822.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370b174f7b8---76373973342.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kerijo.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/bebumenaj.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tobip.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/38441807969.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/46755511193.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/datogugisafowevigoxamanu.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/92842360577.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lorugofitizebaj.pdfIn PDF document text
    • http://elskenecologie.nl/files/xatabazavokiz.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/nanusawoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=paranoid+anxiety+attackPDF 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10456 bytes
SHA-256: 431eecacff12da603932e6da9b14eb14adf966814a4435f5e7bb0d5e0b7a9309
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 18568 bytes
SHA-256: fbf4d291903502b56d32624fe8d2fa66f97c3ee0598b53fe93348db8fe5cd6ac
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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