Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b348c208881c60f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8c71732c6632e4c364c0e6966ff660d SHA-1: a773542701eaa3f56f88220c684f804d7ab3dc4d SHA-256: 2b348c208881c60feb950101ae4817932fc45681ddaf30899e83526ae530a3b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=pull+and+push+marketing+example PDF link annotation
    • http://tacchigroup.com/public/thread/risorse/file/rafekufixavulimip.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/70971517314.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/8433788662.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-26/20210926031854943186.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/zezoda.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/tarapitawefixuso.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/podafiliwotimutolufoxex.pdfIn PDF document text
    • http://gojjang.com/uploads/files/18041140833.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lutaxopazifo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/wokojekupexarig.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/84342471520.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tukodamo.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131452217956.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/nejagorozajofo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bozuzefimez.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908120900.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/78373678020.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/nuxazin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zitibega.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/libexerokugozekizibex.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/12257098298.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuresikapajorulorituvuk.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d8d521a406a52839e16e81ed049862e/72236045798.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85546760941.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_off0000b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 11012 bytes
SHA-256: cfdf9ea2447542d5cd66bc7e6010903e582f3e1f2b75168ddc1be3278702cdc3
font_01_sfnt_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16728 bytes
SHA-256: a52fbe715117ab831bfba289a2c9564212d6034eb96291fc58c0d56cd4d6d289
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1