Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac1613e1b8db3bf…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6209b0c24690d3ecdc3879269f82d359 SHA-1: daf60599031c04dbda3d113a540eca8082bc41fd SHA-256: 7ac1613e1b8db3bf155a3c2091dc7208078e4dbb09162ce533724807eb69398a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially malicious or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=poco+f1+os+update PDF link annotation
    • https://alatheir.com/atheirwsfiles/file/71044106790.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/sejipetizujiso.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408ee21d7a0---64335168536.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/dozurura.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/18525337565.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63616736158.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fijuragupemilu.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/solovezaj.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210907_064635.pdfIn PDF document text
    • https://brakos.it/file/14252064658.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/19531738324.pdfIn PDF document text
    • http://heart-calligraphy.com/uploads/files/202109071559346244.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/14663831582.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/dutugejefowapagakumobafe.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/36503418820.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/28778640669.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/46231120012.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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 18560 bytes
SHA-256: 5727aed0d3057de6a87c3b7cce8e0c02a68d11d200b8eb475d128a7f62d134d2
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 10424 bytes
SHA-256: f47268b0d20acec4d1eab43a240d30d4de2fdb12e0ff4a6834cac5f39047c445

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