Malicious PDF — malware analysis report

Static analysis result for SHA-256 6271c065747c3543…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce95f3c4603adf2e2a85a50184f6415c SHA-1: e3529f2b95e02f03ad8fee38932ee9d37bdc2138 SHA-256: 6271c065747c3543ac79f2aa2385a69d5afc886d3e186ef9ee0c2373aae4f6f3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to external, potentially malicious, sites. No scripts were extracted, but the PDF structure and embedded links indicate a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9892438dd6d4eda4fda7875799b7d46e/gamefubelexodele.pdf In PDF document text
    • http://stealthwindow.tw/uploads/files/202109080516128846.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nokusiforiroti.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/lexurumozemug.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/solenulipabowaxuzigeduzoj.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135507576242.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xazovuxom.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210905090308.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/95924088379.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/diruruzitebipuxulisod.pdfIn PDF document text
    • http://poorclarescork.ie/images/9814678213.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/63025954425.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xuzofekikiz.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/95959966956.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132307b5e69d---danumepubi.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109131736519876.pdfIn PDF document text
    • http://scarpatti.com/files/66723616756.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/17332561422.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/lunolapekadukexojiduk.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30930974953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+10+resetPDF 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_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 18192 bytes
SHA-256: 7d5355c50434332096b00292f9032ed2071f9d2b80718cae4b9973151a0373da
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 10188 bytes
SHA-256: 496ab92e734bb07776fe3d754f97031ec10e75c99924b9d180968e0870636814

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