Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e8709c6efb585…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 04:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d126807883571c41b63d7efb76c776a4 SHA-1: 717912987e64aa1a52e65ed00bbc5a5310cb132d SHA-256: ac0e8709c6efb58594c418066a61dd3f54c84cfba19c0938b1d3c4dfaaebb0b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://camel-republic.com/media/userfiles/files/vuzilonanebaweripuja.pdf In PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/zoguwuvaremegedasogizo.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mixisopasefezewutanopiso.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/50826440252.pdfIn PDF document text
    • http://saktigroup.in/uploads/gerezuzuxozuweko.pdfIn PDF document text
    • http://vejwun.cz/images/lezafabobixevu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/94160704719.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///xakexopopetinasi.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/36798759417.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/gutonafelebibusisifeti.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/fevajedunitefa.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/90855603167.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/lojekufoteragez.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/93475638507.pdfIn PDF document text
    • http://otczenacts.com/media/files/nidujuzovajomefowo.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/17040402006.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/84579368971.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/42947448975.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/pipaxofoxakuden.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/44168794756.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/xazebadotajo.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/73501645712.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109010637115999.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kevuxikisorizoten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ullu+web+series+appPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 10256 bytes
SHA-256: 2ea6b23f7dc05b298bb969724616cbd113e98583c4d7947ea264ac7d76cbdeb0
font_02_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 18568 bytes
SHA-256: e15a62ae3069a6f79b302bf1b4e4d74c116c7eb5a9519e3b9e35a563d602b49b

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