Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a9d3a6878a20ac…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 11:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7fe34f29225ca63307a17ed415612a1f SHA-1: 32e89a2e86699cc63e3624566ae279d264af6b18 SHA-256: 75a9d3a6878a20acb41846ac3df609d3faeae465ab1d49eceb90ec774cf2786b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing lure attack pattern.

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://rainwater.cc/images/uploads/files/fukiduxavipapofolebo.pdf In PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/jidizevevagaxuforag.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vubivenis.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/ketorexikesosuzezujev.pdfIn PDF document text
    • http://a899.net/userfiles/file/vapemurabov.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/16285557153.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/wuposizuselefetaw.pdfIn PDF document text
    • https://eklyps.net/images/file/15696857824.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/5063241211.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614100ef5cd82---87445189735.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/zivedumusosufufeso.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/torutipejijomemosev.pdfIn PDF document text
    • http://njchemland.com/upload/files/lesazajojozifamuwumoli.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/19031758374.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/lemavubowogimokudixa.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/7029943782.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/15693948402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=growing+foxglove+in+containersPDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 10804 bytes
SHA-256: 2107d8e0e2223cdc0d9c2f5dfa5576df40c03d132b3c90f5a5719ea604f33121
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 18500 bytes
SHA-256: cc55659b0dd36bd2f368878159cf941b7c6626d48149e9894eb02e7c2c143144
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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