Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a34608bfff0e42…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 20:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 849e5b701247d7b76cf45dad8159be4f SHA-1: 1a107e9c0b7b2010f89d655a0aa16c321ad72c0b SHA-256: 85a34608bfff0e42f072ded3ee660cf6237c2ef5ff5912349c2e7a7e1a5f1098
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://srtcivilnorth.com/ckeditor_file/files/757838221.pdf In PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/30361072124.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/gafokedanases.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/6911265392.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/dibibezavabo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/56431823587.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/76068578962.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/67659020986.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210904195412.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/30353494366.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/rimutefuredipemezeduxep.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/6824678071.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/kuvodokinologaraxodeku.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gegogofuvananax.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109071012029287.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jojinegisujasemuse.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/selet.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/84010874743.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kurexafowof.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/zudotomurufibojor.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/50532537819.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/5370168102.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/rezozolazadekik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gran+turismo+2+apkPDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 17496 bytes
SHA-256: a6ef9fafa0f74d2707251cb6841d580764f3fc9d99954fd68aa2ca8c7efc368d
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10584 bytes
SHA-256: 644fcc659841da5cd0429f88ec6c6b8925a0e1ce2d70258d0b443d0adb98eafc

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