Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f0c301be41e15c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 12:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9cb29dab6d153ce1f47b5d8761a9066 SHA-1: 34ad959aa7c80ecb2846a0aaad513401937c83a1 SHA-256: b2f0c301be41e15c236389de5778636351f732aca256366db04260b6a2dca88c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. It also includes numerous external URIs, with one pointing to 'http://balmybnb.com/t/tutorfirm/uploads/ck/files/zakakaninikovob.pdf', which is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://balmybnb.com/t/tutorfirm/uploads/ck/files/zakakaninikovob.pdf In PDF document text
    • http://www.s4b.nl/upload/files/riwevemukizofevib.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/45439209211.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/21018436897.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe4b0f6df---woxelasofusigagexego.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/dematepepe.pdfIn PDF document text
    • http://favourtec.com/attachment/file/47254002876.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/6453522834.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/95538065355.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/85603232250.pdfIn PDF document text
    • https://landi-bg.com/images/file/sinej.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1a20cc25---1246321812.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95536382386.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/piburulapoginib.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/11188012511.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jojufiwerep.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/37473847239.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/21840861942.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109161305294756.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910032706.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/fikatasemotawiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+hide+smsPDF 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_off0000c0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B6 17244 bytes
SHA-256: 3ed0a3711ef97bff77c53493d5d0d6d09e0d506ab969ea5d6cd4a39689de440d
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 10180 bytes
SHA-256: 6659d160c5461d41a6f79710227511000b97f71708e5ae98acca2ac95ac9e4e7
font_02_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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