Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9fe5a8bfaa0952…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 16:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9020003a07aecb916c3ac3ca9faff096 SHA-1: 20d780da3a683aea509ab7334db8d79d125c1018 SHA-256: 5b9fe5a8bfaa0952e3e68f5ab15d575bfd1c1b92f4ef5d858b72ad950756bb88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being used for phishing or malware distribution by directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://matkinhantai.com/luutru/files/41886227607.pdf In PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210912_8BB724894FC7620D.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210917154830_3s1yt9.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/70263054473.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/lomemotafuwin.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/34385574061.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jokudiwup.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/buvugaj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c3edf5bf---99481367950.pdfIn PDF document text
    • https://wita.lt/images/files/babur.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/xujobuwuf.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/15597041052.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67076811099.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/tanefovemovi.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/baxapodiwo.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/23411962282.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/70382215437.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oukildtlvvh36a5lqpvt6h0rkb/dikevuxog.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tuseminojuduwalimufa.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/36386439830.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42436030380.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xavirerupo.pdfIn PDF document text
    • https://asiapharma.la/files/files/nidusokugezi.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kupakewakosebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stock+market+app+for+android+tvPDF 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_off0000bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8D 16344 bytes
SHA-256: 785d4645e59c74104e97eef57fa8b056ccf176edbe9e61e2039897de2550bd77
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 10800 bytes
SHA-256: 5654a9fbfc6a53ae7a556b40924a2145e0fe0247832a53fd5f9cb8983a2212ac

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