Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd91fdc47c3e5c84…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 03:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 388b4e05dafeb7feab4923160603e022 SHA-1: 664dde0579d0a1dbafbd415252416201cd9837c4 SHA-256: fd91fdc47c3e5c843d72025b6be6e05aec194025f5b9eaa5ae881b895334ab89
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 0.9947

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://allytemp.ru/uplcv?utm_term=redmi+note+5+pro+vs+redmi+9 PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48bc092a0---83543861611.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/46743791720.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/firosemejam.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/domopob.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/70055399410.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/51763451746.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/kilafexelub.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/donutojekijagomikegixot.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/79582000176.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vasawevowiwodizedosaza.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/44702009222.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/goluwaxizefewowil.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/5423349813.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lizibizijalepikaderumiru.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/26622051911.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/robebedi.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/mikaligot.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/33832236070.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/28866022695.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/62621717185.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/44794016650.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/71493144158.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d3a72d85---46673045356.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/tirez.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/15241159659.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_off0000bc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4D 10760 bytes
SHA-256: 9271db59b8b0681cc560f2923ca0ad880db5e5a184b52c2b121bf15f3db41fae
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 21016 bytes
SHA-256: ba47c980518ea615bf89a5c62d1e2a3357b19a94b03ee75df7c5a6e930221b24
font_02_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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