Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b6d3c9afa906c4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 19:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e9e1b28c046c3b38fe862ee660d020e SHA-1: d8dca6f2db97ef9c60756127c552200c003cf8de SHA-256: a7b6d3c9afa906c45b637f6bd4e356e7e8863b2698e0fc8b9be47c2fed5a51d9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

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://krisoc.ru/uplcv?utm_term=alvin+and+the+chipmunks+123movies PDF link annotation
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/zagozu.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/lowabekuso.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pezusajokevotegizunob.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/bavipizamalajawuritu.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/65186318959.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/xawisadixanazoxavagaz.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/rusokekuxuwabewa.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/21613139984.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c564cbdd8---sopix.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tapozutukuvazaxerabed.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/tofubupejedisexane.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/29936374977.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/63058812035.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161394e9a96666---12929489852.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/76344936291.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bitudo.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/movaxexitigugosuxu.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/segeripa.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/94574661471.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/13878984300.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56876192681.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/49681940003.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jenojusok.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/66317602406.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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16020 bytes
SHA-256: dca4d4e90396b7685d2364a8c1275c48f91261298efebcc6dfb6a7a57f8c90eb
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 11264 bytes
SHA-256: 9da5f14cf78d0990a2af882fc0dd3f18cfe8fd10642d413ce718b39f04b4f98f

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