Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f0719e008f632f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 21:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 485067d64ec310e4eb788d01ced71060 SHA-1: 7122a1e0c6b7eacd99ff7d948c484926bacd9140 SHA-256: 88f0719e008f632ff9dbd91c38f4b912d552e17e13787cdaa9415756df423b9b
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 0.9982

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f114f61---navesuda.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l8fkrm06pfhpj08ejfh9k3n3gn/94778649417.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudiwakoxaw.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/12183203448.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/40081080983.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/32511057957.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/39316367102.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/64394692973.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/43728645011.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/85787405877.pdfIn PDF document text
    • http://cichanski.com/Upload/file/31655033267.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdfIn PDF document text
    • http://haphadoor.com/upload/files/mejiribisubetelirepinos.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/58273417310.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/90802600096.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/86809305220.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wipelupemalanisujapepibij.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/49730142789.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210910_2AE3E2099E5C9E4A.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zaxasilepunu.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • http://clingac.com/d/files/wagenawur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=adb+connect+over+wifi+connection+refusedPDF 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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 10632 bytes
SHA-256: 4a95569812b4a83ec62471c881c101091179cfdd093eba0c0f0baa4037770708
font_01_sfnt_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 17580 bytes
SHA-256: d069a8d5f9e155eaf9cbcd52ba38a893604e1fe79219562f4ac96324919cbccd
font_02_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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