Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fc294e582f222b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 04:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 569df4c8f5b0de3c97f49e84e9cc5baf SHA-1: dbe9c1a55e8abe6094b162f907d0cf7989ebf870 SHA-256: 91fc294e582f222b046dabbd6ec72dc3549fe4ea376a955256d1663ba4f96ced
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating it likely attempts to redirect users or download additional malicious content. The presence of JavaScript points towards an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://capri.lt/userfiles/files/30840518726.pdf In PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/23699283626.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/fuzoforosakemenejolobedis.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/62257518837.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kesipelavuvefegimugopimod.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wixetejozofa.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/sovakiziwepo.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/gewoxese.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/13443799464.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/58120931897.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/megogegudobuguma.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/vurowimive.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/71008768647.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/22096134918.pdfIn PDF document text
    • http://japhina.com/upload/file/setetut.pdfIn PDF document text
    • https://mimpishio.com/contents/files/94642710539.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/35931047886.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/27477950253.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/15946822902.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/daponuw.pdfIn PDF document text
    • https://panoramabyty.cz/content/lebita.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/64299004044.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98832aab2---vamezivifozazube.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/52603257570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=prince+of+persia+1989+androidPDF 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10896 bytes
SHA-256: ea563f72a565f79e99edb88d88dabeb86a2e5b4faae2df1ab4b531c7863abf6a
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 20080 bytes
SHA-256: 8456332abfd592f3cb4df8229dce8dfc08b3b953cb10088f49c9d7276c547691
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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