Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e36de000e6a26d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 10:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 417a6a18059113bc6d45826c03bb90dc SHA-1: 8e7d26c0fd625a1c7ebb155b7e4bec945c23a81c SHA-256: 39e36de000e6a26dfc0373de7bfca779cd2fe96b5633a01c67ab3e0bf0c01cf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://fitviewer.de/files/file/pojemimofepugisiju.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/31748877747.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/98601660727.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/23cd8d7e293dd2f0fecbd57688b46baa/pusimobaxoniteg.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/80082145469.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/7495919948.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210904091140931.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/43780625456.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/89081259336.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61650155601.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/62297908119.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/bijonuzuvetazudo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613534e62d0bf---63940651950.pdfIn PDF document text
    • https://digireg.dk/upload/20355747896.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090907514573499.pdfIn PDF document text
    • https://virker-ikke.dk/files/wazajejubij.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/57826011578.pdfIn PDF document text
    • http://bjjiffy.com/upload/4676983367.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/fagemaguzodavuze.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/gigororuzezejepi.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/87736128874.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210903231818.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/4930984721.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090911045173499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=psu+supply+calculatorPDF 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_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 10252 bytes
SHA-256: 450976214ae0aeb97f242d7a27707ae3e92eae0f6600f2fd39700979c77dbf3f
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 18104 bytes
SHA-256: 17e5c0ed63061a718d5d7cdca7ff793831965e1b5c62274ac5b1b4ba9a3a97b3

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