Malicious PDF — malware analysis report

Static analysis result for SHA-256 954ae9be27f2e178…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 02:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7931fc47b6de20cb72c5b72767c5da51 SHA-1: 8ce0e35b15180b138b0012a7f703e3d9809a218d SHA-256: 954ae9be27f2e178c72624285efa8b67ec88e9d4aef743286826df8281dc4dcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to distribute content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xedulichhaiphong.vn/images/news/files/medugotopev.pdf In PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/31978621874.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/25688727491.pdfIn PDF document text
    • https://negaratoto.com/contents/files/13765899345.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47627788197.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/66023792444.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tozivakomuta.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f496a4a---4762047433.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/3967200480.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/murazakajigeripek.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/nijefis.pdfIn PDF document text
    • https://somogyplusz.hu/files/40110240845.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/35437851612.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/84036362125.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210907_D8987B22DB30C14E.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161356ee76a10f---14042785712.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/koramazamifodowezagusa.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/70339879852.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/sekuru.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/23419657820.pdfIn PDF document text
    • http://strongpointmarketing.net/userfiles/file/xofarawa.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/jenajesewifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=play+store+2018+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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 17744 bytes
SHA-256: 524682d2efac83511efefca219d4f17526c28632fa0b6eaa47d2ca8e99de4219
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 10756 bytes
SHA-256: dbad688fe0d7f046750eab7055d4c1135e5dd8274f834454dd3f79d6b78ff0e4

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