Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb123597d5cb7d0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 10:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c8bd7fdf377ac78b5c8b012ab3f31424 SHA-1: c0c961d5cf16efbb0a9978390148fd57bf01561d SHA-256: 7bb123597d5cb7d0b82802cd4f3c0608ad599247e2619e43e29c5324e0676e15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://aliguoriarchitetto.eu/userfiles/files/topomaw.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/79001271630.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/sidiletimo.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/xaxaxudidazew.pdfIn PDF document text
    • https://mbbs.hr/files/limigetonatazuvi.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/46226142485.pdfIn PDF document text
    • http://rayer.cn/d/files/70545487200.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109060053405680.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109021921034848.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/vaxab.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/42208343399.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37809294682.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kemimokasa.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86843410406.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906012225.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/18601193956.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/63412546669.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/89335238476.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/wutinideroxasowekiwewewa.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/3208729758.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/16196253965.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/piwalefogozumekotame.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/dipawiwemarora.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/firiwufut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613551428ebf6---37958694254.pdfIn PDF document text
    • http://mdtrend.hu/files/file/faxoxamipiduzizelitak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tekken+1+download+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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 18148 bytes
SHA-256: 9d9f37b03838afe8c814e662e52bde8e2c23402b9f3e056aa8b8233ff4f2bc7e
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 10120 bytes
SHA-256: b3f3fd02b8bfaed5f50b40f0964049b69c7a46725f806a4c85da3bfd0da8b1e7