Malicious PDF — malware analysis report

Static analysis result for SHA-256 871c5a972393350f…

MALICIOUS

PDF

94.2 KB Created: 2021-09-15 14:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c511fed76704d11f2a4e8144620a6c78 SHA-1: 710e63e4f670b1118cca76a0a15115c9981ed396 SHA-256: 871c5a972393350f04cf1a7a15402e7cf4d20a25ea5c90fd6b5ca783844fbd0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9528

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://crewmak.ru/uplcv?utm_term=shadow+fight+2+latest PDF link annotation
    • http://charolais-hessen.de/write/userfiles/file/xolazuburunezetu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/20124277936.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/68621620331.pdfIn PDF document text
    • http://siroyensao.com/upload/files/97732836207.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pibak.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/12275649570.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/33661433089.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/42137391223.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/436510864.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/papevafob.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109060855525628.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tazen.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe7a865a6---55729689979.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd65d375f8---fufapad.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pivupu.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/72921159201.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nituxilofefoposuxu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/dosizedukunapejaga.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/87997839456.pdfIn PDF document text
    • http://ropesadventure.com/d/files/43342888788.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/tesuvasovedujomuwuluj.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109082129592682.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tixepujono.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/7217849775.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pepulawos.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wunejenorigexokeliw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10712 bytes
SHA-256: e1fd42efa7daa210539d8bff9be86bc76563ebd51ca33b96a64d1be189712b32
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 26536 bytes
SHA-256: ee59378d30d4a32fbc4d777afbbf963ba04c25bd71d667791cf897ca2bde43fe
font_03_sfnt_off00014a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7F 16284 bytes
SHA-256: db88aa309b658614a38a459362a1412611d4fbcacab0fdce1882d57bc04e3c99
font_04_sfnt_off000160ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AD 2208 bytes
SHA-256: aff9f6aa6645c9f97ef09a6ade3d9c3c9f369c58cfe2278afca52e8a1328c01d