Malicious PDF — malware analysis report

Static analysis result for SHA-256 407e7c8c0c5b2602…

MALICIOUS

PDF

76.2 KB Created: 2021-10-06 10:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 013e7f055a81a749c02e231768d52369 SHA-1: 2ce87dc964ca7a37ea5216d4fee63ce429e667a7 SHA-256: 407e7c8c0c5b26020d187b7069556cb4c51e55b298aedba70aba85f9f2783e31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://chcial.ru/uplcv?utm_term=system+of+equations+using+matrices PDF link annotation
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16313422988312.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/78793535388.pdfIn PDF document text
    • http://ipceurope.be/assets/file/12537512539.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/monoxefefisokomafanejupan.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kabas.pdfIn PDF document text
    • http://budka39.ru/files/50374752451.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wirekagorunifekujolet.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/89520232818.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908115705397520.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210921171339_1738889016.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1633173113.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/35107878313.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/60630565283.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/29109933463.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec3664dc41---68198141966.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202110060506395202.pdfIn PDF document text
    • http://vln.nl/files/file/91970056121.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/47542552962.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/saruvumitesopijamezuxow.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/9619353020.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/92909568123.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sujixek.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/lufubizosaje.pdfIn PDF document text
    • 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 19200 bytes
SHA-256: cc500a5c9b39f5d00fd58ea5577a44d2594e7dcfd80b0d657d5868d556102162
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11068 bytes
SHA-256: 057fd3355f27878a044469f87c057f512b0707afbf882970bc3005be39adc1ee

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