Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1be231ed9561f7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 02:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cc1a8f9b7997d116415d25531e11779 SHA-1: 5ddc533df8b2520211024725e817da38e1a56da5 SHA-256: 7e1be231ed9561f7eadffab2dbbfd267b8e420956210a814e37384d7c6ccd32c
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. It contains numerous embedded URLs, with one heuristic specifically identifying a 'link farm' on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://artdental.hu/editor_up/gukegamomumobuwamivedamu.pdf In PDF document text
    • https://5udua.com/contents/files/bejemof.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7ff0abe3---15431495317.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/gazirazofategodopezazog.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1362279181613ea126b0d32.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/pufujedisa.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/vesizujisatujagope.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/48872524885.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210909_F3F3278CEC86F48C.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614231d7683b1---47916224748.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/44140858441.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/fokikavoxirez.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/vebororegejuwixuporule.pdfIn PDF document text
    • http://kyea.org/imageuploads/lasodadul.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/lezuwotobubebivegared.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908023424.pdfIn PDF document text
    • http://topflexsports.com/uploads/rekodiziv.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/49303956396.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631836723.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiwuwulotazaw.pdfIn PDF document text
    • http://freeorden.com/media/file/wugufafenazezetul.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/dumedugija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=toca+life+world+all+unlocked+mod+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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 17516 bytes
SHA-256: a54bc9fdfdbc96bc2012e3ba4e7d12a916bc27f602a03f912593ff79a015036c
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10756 bytes
SHA-256: 706840a89a676bd159fb4df30f915ab8ebf25f1d572bd7e980657c405b6f983a
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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