Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8454f0fcabc7b2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5233c2b4cd56b7604c9f77ea0d7940e1 SHA-1: b071078954da16ec8297447e741c500cc57d37dd SHA-256: fe8454f0fcabc7b2f7aecab703f319c5936bb18e2c30cd4f154785953773b8c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. The numerous external URIs, many hosted on disposable domains, suggest a link farm or phishing infrastructure designed to redirect users to malicious content.

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1111a07faaf6f3f8148582e80f723f33/10373150516.pdf In PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/16186096090.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4c97f8e4---kader.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/55961204146.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/64338236140.pdfIn PDF document text
    • http://hmed.vn/upload/files/14800451367.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/sugadipuzulas.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/71136327829.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51862966327.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tujitojipozinebiveveje.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/14871041294.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wazodiwikowosimepeveb.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jesavazigopoxuxosakab.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/pobel.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/38021166703.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060954536590.pdfIn PDF document text
    • https://suksesunited.com/contents/files/lunalaji.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fuxagelojuduxowo.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xolexiwerubafuxise.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/dizunufove.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kegozutulifewemutoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lg+latest+smartphones+2017PDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 17676 bytes
SHA-256: e94abfa744f10aca36e1c1bebadb67514c5f8f1150002bef60a19ba23ed8011d
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 10908 bytes
SHA-256: 7eaf35d03d03631fae2c9ab2875d8b158a508dcfa44698d55542b57411affa73

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