Malicious PDF — malware analysis report

Static analysis result for SHA-256 1864dc9ced201432…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 21:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e71d254380613f82b0f32e31b6d2328e SHA-1: 4eae23280405d01021c5d0ccfed722e1bf2c1e1c SHA-256: 1864dc9ced201432489581c09a5549b41271416200ac25bb45cbf6b22608b869
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to lure victims to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=what+games+can+you+play+without+internet PDF link annotation
    • http://fecoil.com/userfiles/file/bewavirulivodup.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kevomowisope.pdfIn PDF document text
    • https://seger.cz/userfiles/file/11345667283.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/sepozuvidesamo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/junizifejeronivej.pdfIn PDF document text
    • https://highrise.pl/file/4099498803.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/turetusewoxumewogasup.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/25322549321.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/38613992868.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161303875531ae---wifaxatap.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tedivipasowe.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210902050648_996289948.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/togofulogapomotanimasowi.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210919_170040.pdfIn PDF document text
    • https://keongracun.org/contents/files/38912249222.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/77568213644.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/46384304016.pdfIn PDF document text
    • http://bastola.org/userfiles/file/15520182704.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/76532257122.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q3uf1pmg6bpfmpvf5nna9vi2a3/kojudepirupuzapoxokeval.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/52701992897.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/4515934769.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/44434353590.pdfIn PDF document text
    • http://chinalabware.ru/d/files/zuwutalasosoxuvede.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/melonokakufiwojabigakes.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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 11116 bytes
SHA-256: 8d336b25c10c952fb04c483613a2210eb5294999d8985e9d0ac5549eb9f0253a
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 18688 bytes
SHA-256: dd1265fe138c1ce509a88a7b18c6ab5bd9fc4d112bb96784f536f25d590d3f15
font_02_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1