Malicious PDF — malware analysis report

Static analysis result for SHA-256 f674563e5527a527…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 00:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69d1c01b29e7c9758c0aa1317a147b67 SHA-1: 6a3bd96265ab3a1995515822644e652360746f36 SHA-256: f674563e5527a5274fb48be89195846533569dd5e3cdfc49af0ad8b0ec87d46f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The PDF's structure and the presence of external URIs indicate it is designed to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pragatitic.org/ckfinder/userfiles/files/feriwubogubixuniser.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///20219242298234.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/46102134263.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xapilazerewanimed.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/movalemoravofokofezipolas.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/23626220312.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb54ac63f5---papitokozukobekibomagew.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/51541920670.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/78380600177.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/paxisesukogedopusanore.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ae2b98103fa777aab9568c4241dbfc8e/fejogonurasuwoke.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/zukotavomegadediw.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/voxegasefazozojuven.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/mopagodidobaleguxav.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/34868648543.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210902184457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=conditionals+exercises+b2+pdfPDF 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_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 11004 bytes
SHA-256: 84808113035b4aeb386def6cffb160f33ade6e069ccae8eb14f008e7d9d12d78
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 18244 bytes
SHA-256: 2f3f09c37fe37b5df8304a750202fd86c31ccdd3eb6352021f1235b8281c80c0

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