Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaf284d736da08c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 00:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3145d2d0fe9e2603ccdb77fbcd1f5a0 SHA-1: 840fe86c1b6bbdd4cdc8535cd479511ea39b4f22 SHA-256: bbaf284d736da08cb55f061e9d944c4ab06978c67c6c5a0ffc0ae8b011c264d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these numerous links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=sivaji+tamil+full+movie PDF link annotation
    • http://chiengthai.com/file_media/file_image/file/jigigavinilepefetikagu.pdfIn PDF document text
    • https://atl-50.com/files/file/79016874532.pdfIn PDF document text
    • http://abpaluso.com/upload/file/voroxupetimaw.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/79249047367.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/18431908458.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090423060145.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/41303499856.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/lamototezolap.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/38556316424.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70de97e52---vopajixaresipeto.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mubizexelo.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/nirukajevilibo.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140847107747.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57582500574.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/lowemuf.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/87190090963.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/dekad.pdfIn PDF document text
    • https://preciseenergygroup.com/media/vapafufozul.pdfIn PDF document text
    • http://guchen.ru/d/files/85657069199.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/14457697903.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gevegojosakunezapasariro.pdfIn PDF document text
    • http://dasbluemchen.com/ziwidimebujigubokedo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/18207114251.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/61989641726.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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 10376 bytes
SHA-256: 6477d96145eb1adeeca7bf03aa0f8f9a00411e1191328cc44b9b910a9fa3aefd
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 19316 bytes
SHA-256: 53b86d5a8c2ca795407931c70322e0c85f7b32fec3ee8d4e9f9b0f47ef0e74a3
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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