Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412f92c2ad55c0f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 903d9605e310b3ba6ca92ea60b51aef2 SHA-1: c0b043183faee2b3f8354cfb1003ba7b36b68cef SHA-256: c412f92c2ad55c0fd4b7263f3f462dc88508a8532f5988e33f57c526f508d921
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 domains and appear to be part of a link farm designed to redirect users. The presence of these numerous, low-reputation URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=the+escapist+2+apk+multiplayer PDF link annotation
    • https://mimpiindah2.com/contents/files/mobobadub.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10027424564.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d346b0ee6---batixoga.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/67521342966.pdfIn PDF document text
    • https://netlandschool.cl/files/98171160548.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/10957035922.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/jaxojow.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/9728577215.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/36423635784.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76014707925.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/66615539002.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/pebisonezoxidiwebizo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/laresuxajeregefu.pdfIn PDF document text
    • http://th-hl.com///upload/files/nozuzojefosa.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/30490211321.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • http://atek-ent.com/upload/file/42954757659.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/xemuxowemig.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/41625592769.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/82877349278.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/14894050527.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/47912520748.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/tikifukimumofi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 10804 bytes
SHA-256: c5270a8dd295504ca85f27ef9a41bb7e59122d8baeb043f7733f35ab498dffe3
font_01_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 18900 bytes
SHA-256: 95c5064f3a1115c346dd951f517075e36198c2d9a5679840b7082a045a533b70
font_02_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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