Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14b1e9ff1acc1bf…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 08:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73cb828afa90406527b59d4aec4baf4c SHA-1: 1bae4870f3f8c080c0124989fb4030bbd1caa93c SHA-256: b14b1e9ff1acc1bfdd3dba6a1624d951892fdc99e068718da4da8210468d52ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream and numerous external URIs, many pointing to potentially disposable domains, suggests the PDF is part of a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a13e8747---87913336426.pdf In PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/fowejojovokomirusum.pdfIn PDF document text
    • http://espwireless.net/uploads/file/jibisibebede.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/53798908834.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad681461d7b3859e1008374fccf38066/kewuwopafalumejebaz.pdfIn PDF document text
    • http://plise.org/userfiles/file/9739811885.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/sinokonovabakapemaz.pdfIn PDF document text
    • http://afro-safari.com/upload/files/88132843075.pdfIn PDF document text
    • https://shidoremicrosys.com/media/18313596633.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/37289507686.pdfIn PDF document text
    • http://kotolantopeni.cz/file/fujosikefavevibepirasapo.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/kugukenikanobawog.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/74459545282.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/57608100683.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94331221328.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091122475173499.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dejizategabowonukuni.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/momuperoveniju.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210910104337.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/duzivuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=demon+slayer+the+movie+mugen+train+watch+online+freePDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/6852175102.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_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 11148 bytes
SHA-256: 0815a77775dbff506e52c3b89019e4272acd208ea9d6425d3bce7d1524566011
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 17580 bytes
SHA-256: 2897886113462a4f913a1c2cfe202cc2cd73723052034b1ffffffcbd56fc4c39

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