Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a26ec58e984861…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d343a54b2de5b9be906b2493060d05 SHA-1: 595e9eef03b2e5556bdb59c71b0d97c5f1e59c81 SHA-256: e6a26ec58e984861cecdd8aecb1e37ab9e50fbf3c0082c7346939ad5b473f53b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the sheer volume and nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=words+with+double+letters+at+the+beginning PDF link annotation
    • https://odontologosmalca.com/images/userfiles/file/80020480341.pdfIn PDF document text
    • https://luminex.pl/upload/file/87811570286.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/mofusofusibugetu.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/37658968059.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/7213535195.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/kitemarowukemoj.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/84997954548.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/tasigorexebebu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/91041803880.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/37152558212.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090206042573499.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xolas.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/natiw.pdfIn PDF document text
    • http://mcutech.net/files/65778712239.pdfIn PDF document text
    • http://rooptex.com/uploads/tatafebukit.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/25226644199.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a297ec227---viparepagireruwesire.pdfIn PDF document text
    • http://novafish.it/userfiles/files/nodoliju.pdfIn PDF document text
    • https://svltv.in/userfiles/files/58111595579.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904205054304.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919191511In 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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 18100 bytes
SHA-256: 555cdbccfa5ac5947191dc679c04eb03fb3267b8ae3f9606ff3182f56b39edf2
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10848 bytes
SHA-256: 72a75a85f89dca26eeb024657fbcb72d4819c7dceb3b789d387cdb35a3d4c24f

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