Malicious PDF — malware analysis report

Static analysis result for SHA-256 362eeb8162ab3ded…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 03:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 103628ac3ae5930df8606e1a1621bb6f SHA-1: 387ab0ce331b88ce2350eaeda0dd1f91d3b65a0f SHA-256: 362eeb8162ab3dedfa66eb67aae42d528c27e180b7b37ca32946d860be6984c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or redirect users to phishing/malware sites. The embedded JavaScript is a common method for initiating exploits or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=all+movie+download+app+for+android PDF link annotation
    • https://easternresources.net/ckfinder/userfiles/files/rokanewexikojowugamosasu.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nujagadojupibozolitaz.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0417314001630567203.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/75642579952.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tubeg.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/16971151269.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/venidaxelupawiz.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/2146872770.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/feduru.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xofonoxesukigese.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd4074e52---3680091345.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bojapizojafiw.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902055101_7mwpzv.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/59425839974.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/6631345806.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/37448617297.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/84898649855.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/3498591269.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/13709783173.pdfIn PDF document text
    • http://vodnik48.ru/content/file/zadunexorefoxumaduref.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/64626912635.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fasibujukutekoza.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/zuwetakoz.pdfIn PDF document text
    • http://iscelenie.info/files/file/guxoxorefiju.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_off0000b97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16984 bytes
SHA-256: ba9a50d6f03d7e34c4a1975c31fe21aa72dbdd544b29a8cb2300566b4b0d5567
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10528 bytes
SHA-256: 824add583e33114fdba6ce89543b38877f090c4168601c54a45a730a8773682e