Malicious PDF — malware analysis report

Static analysis result for SHA-256 b027641eba054448…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 21:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5aafd1850c667f2f33f0929756b9823e SHA-1: 8b80b71ae0489e29416553b1a55e84ba2185f480 SHA-256: b027641eba054448bcec70b630a5360c4b3774a4ac52a28e5408e21154c8c78f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=download+game+sex+android+offline PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beefeb332d---vuduvi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60592526916.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/66177398682.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/biwokawelako.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/70018633986.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/74291046075.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec324e9011---nesenuwosegexivej.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/27495210436.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/61361955367.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/61191781174.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/48140177506.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/dekeramaxulajun.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/samew.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/biwanapidiguk.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/18073273718.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/savuginodizexod.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/bovukutewapivamuzipuropo.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vokebak.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nujokojimewuwavubinusovap.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/xebejesum.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 14976 bytes
SHA-256: 12aa0fbb86263b84dfb90f763c977b65ca651eebbe56fbb23f5917d9dcec65a2
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 10788 bytes
SHA-256: 12caa212eb31a4df54c2fdc15e491d6ef61a41023172c5a5a77a94d337d9f75f
font_02_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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