Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a486eabe33ccbea…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 19:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7feb7434fe3b970ed62e4cbb9487f2d7 SHA-1: 847687dc25e76db2bef48d6712d97b8916623dbb SHA-256: 3a486eabe33ccbea4160d5c4b10719e907c53bf095c912438615f85b74335419
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://siroyensao.com/upload/files/27826061475.pdf In PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/mosabidiviteda.pdfIn PDF document text
    • http://xprchemical.com/upload/files/kekudesopatojetaxawub.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/girubutevetudaxebirofak.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gopiwipijekowoloxu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/miniwatolomifazufuxobojog.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/midonigob.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/derunon.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/6730480586.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364e44b9c92---jiropuvamexegafigifikewu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908005339649553.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/55155324343.pdfIn PDF document text
    • http://synphabase.ch/upload/file/74772723247.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/79729277767.pdfIn PDF document text
    • http://futboltotal.net/images/files/xibejon.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/668175206.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/39f76536695f112c597e29d76f432137/bamilomotu.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/56029637930.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pugoriwodewurabi.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/46591625547.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/jidutenajulozajaw.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/rupofeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=forgot+pattern+lock+androidPDF 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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16188 bytes
SHA-256: 5bc2edf45d95281145e53a08a969502ba483590f72ae4ae400fe6741cb4c03dd
font_02_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10592 bytes
SHA-256: 6f97d8ef399710a12e17dcb349f6db338ad39a0da347f515acfe0b67f39635f3

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