Malicious PDF — malware analysis report

Static analysis result for SHA-256 f679037fe31cd33f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 19:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2256efbfd2a3326112e63d7050e50428 SHA-1: b9d22ce2d1428e4e202e0aa0045fbb7280fed952 SHA-256: f679037fe31cd33ff263048ec8c115a5ebf0c3c907d691df346acfc6f27007f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://yokohama-model.com/userfiles/files/mosetegojezowevaxaruka.pdf In PDF document text
    • https://eqonetech.com/upload/userfiles/files/6515100042.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///67034313907.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2289_20210908143722.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xiteluvumatopemufesifoka.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/56291842243.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/xafovibenitufexajebo.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/dozeg.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/26461743599.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69618060819.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/zobomuvolenuroxuroge.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/fakizidetakakuna.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/dobovirukosivobikib.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/xazakezunibomomalumewa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/51de8120d7f018481a3a1cfb3d866bdd/1351609939.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/96936508131.pdfIn PDF document text
    • http://showpelec.com/data/file/20210905_195302_456.pdfIn PDF document text
    • http://oris-am.com/editor_up/mimosotafusig.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/kazutodixi.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/komarokoxobivesik.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98806097466.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/58121134615.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xozajejojiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=all+my+life+film+streamingPDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 17140 bytes
SHA-256: 906cbe79a258f2ec1d3ecbea345fc05beb68fe382bfcfcb099bf26d86bac93ae
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10532 bytes
SHA-256: 7f7582cb0068d7857196e46635baeb5b6792f74853d78fc0c1469aaaab67df43

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