Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fdace0bd71e766…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 08:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c418d2caa66d78ea879efcb689fa92fc SHA-1: 9f5b67414a057babf9336b0c8bbd0a316a4763ff SHA-256: e8fdace0bd71e766da4d7a7b2cd88e707883740e53e3433ccf246fba9b45418f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=latest+non+veg+jokes+in+english PDF link annotation
    • http://x04ydivan.ru/userfiles/file/71325824506.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/60644836425.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/foridikenuxuxirozud.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23992848940.pdfIn PDF document text
    • https://istanajp.net/contents/files/16663841861.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tologelopunezum.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630845015_3be2136ab4.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613e321b04768---xabilurilaf.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/85565348657.pdfIn PDF document text
    • http://metapolar.hu/tmp/26694474024.pdfIn PDF document text
    • https://reniuved.it/file/xilev.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/25333545181.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/tijopez.pdfIn PDF document text
    • http://handgun.ee/media/file/27457781167.pdfIn PDF document text
    • https://cian.hr/userfiles/file/memejebaramazik.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/tuxalorixixolaxijizil.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/fularub.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/96712051443.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/wubazisusira.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/30451785330.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/15893008580.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/77137378436.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nobogubenitagef.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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 17808 bytes
SHA-256: 6a31928ac7604692a292af96260ab2b5c802cad303f76f6861442763a5eae0f8
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10532 bytes
SHA-256: 68ddf740340519546992a37383db4ccba1513450ee3ba6247be568c03c94b8f4

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