Malicious PDF — malware analysis report

Static analysis result for SHA-256 433054298bf81839…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 16:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f37596bd6bd30913f1f94070425504a SHA-1: 5d125ccb28f1c087d2c2c0e723ba13d13a1eead2 SHA-256: 433054298bf81839f1ad0bf3d6185e09aef23f09bcf9d1c173be230a24de2753
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a link farm, with numerous URLs pointing to disposable domains, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harmony.im/userfiles/file/68452261874.pdf In PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/63603597330.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pobosejoxo.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bijinulexulojumuresus.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/tukixajamutunuwukakaxu.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/7434460818.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/98113769652.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41816524447.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5135818075.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90803020997.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040ebaf448---xemonezufixokurimuzuwuwed.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/funafekinefa.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55f4dada---67282099164.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/73218994450.pdfIn PDF document text
    • http://ropesadventure.com/d/files/74641601189.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/ninosagavetasisuluxaforan.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/31414233399.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/96084317071.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/52547302078.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/fifazat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=love+island+usa+season+1+watch+freePDF 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_off0000b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 16256 bytes
SHA-256: e0c473fe40589b74ab32bcbe6550d03145364a8d31d25e86c9b3f1ecaae049a4
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 10836 bytes
SHA-256: 3c877c1a67db7bbdc271531e1f74cb6251b9756916ad55fceff8a41204df3dc0

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