Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aa7ec9c080f437…

MALICIOUS

PDF

74.0 KB Created: 2021-10-09 21:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e1a337b7f47f78f15d2ebf476b4812a SHA-1: 5abea6c67e4382eb113d808a645d8547d98d1681 SHA-256: b6aa7ec9c080f4377ce70b39f876a452682d943d5fd67450580d71954144587d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to disposable domains and appear to be part of a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=hamilton+quiz+questions+and+answers PDF link annotation
    • http://studio5r.com/userfiles/files/63591756702.pdfIn PDF document text
    • https://2winit.com/Files/files/76462429902.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a543c931b82434f59b2f0d42fd7b7d9d/lemireduxozidewogavar.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/zuvisasukiretufegenobof.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/87078696953.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24204661640.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/39773485045.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/62771547831.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/85794677355.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/zofobimofi.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/8683687310.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/janim.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/romokupigudiwivuxu.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/samufarefanoz.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/31300012176.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/pufarutekozanimezenepi.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20210927152032.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/28087838513.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/1297263669.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/genedivenalogozosofuj.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/78262045744.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kudojedofutitupekajofotu.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tezopoliril.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/37915609666.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/75071857782.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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10792 bytes
SHA-256: e240946c792f4712ce56b66258df334c6eaee6064364411f719105ce7c400ce4
font_02_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17576 bytes
SHA-256: 21dfcf1c821ef9e3b6e93514b7a28cd818a234ae352aee0d404c8f6d82b289cc