Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b620a0243a0b3…

MALICIOUS

PDF

76.0 KB Created: 2021-10-15 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c2e0308a81e15295a667071d95a8b85 SHA-1: 6a0f2256f94fe7bcf022d6c53ba9fadf005e9909 SHA-256: 5c0b620a0243a0b30ed7567293ac4e0ad5992f2ef4165ec8b29fdc5562198e3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded links suggests an attempt to redirect the user to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=injustice+year+2+read+online PDF link annotation
    • https://pkmoscow.ru/ckfinder/userfiles/files/gegekekobori.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148602b3c0a3---43323629962.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/bulituxe.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/sijoruwetotenawefanolusi.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/67847276518.pdfIn PDF document text
    • https://fptica.ru/images/file/fivagosavaxina.pdfIn PDF document text
    • http://jiab.net/userData/board/file/giworodovusisakedogum.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/21295375046.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/jatez.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/15030917778.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/lugojimiri.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407522749.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sixesakitudamezozutibunu.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/28209515762.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/jerirudopolirogubedafug.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/271730557953.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/diwale.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/73434231447.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/foror.pdfIn PDF document text
    • https://equinox-e.com/upload/files/51663094801.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f30777802300db38f0ad04a17829a0d4/likufaxefajibad.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/36427770880.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/juwajinopukakufezoxi.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_off0000c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 17852 bytes
SHA-256: 79f8625bc890d0c2712803d8a048285b81ab1a07a2a57128fd2ea092ad49c81c
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10780 bytes
SHA-256: 96afdfb1cd74a4715e5a11fe46423210e52a1f7dc9874887ebb36615f87ffded
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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