Malicious PDF — malware analysis report

Static analysis result for SHA-256 988d53de6a070ae6…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 19:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca69b0adb7f28a55ec3bbbb9f34cd81c SHA-1: a9a95994ddf32f94e8269e6ffce380bdb3f8e202 SHA-256: 988d53de6a070ae67d74adafd87a0e3aa7dd6a53c0ac4e432a3880e22900c696
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. Multiple external URIs are present, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs point towards a spearphishing attachment vector, aiming to redirect users to potentially harmful sites.

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://wastran.ru/uplcv?utm_term=top+10+countries+by+land+mass PDF link annotation
    • http://katachizu.com/img/news/files/fagazemiku.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/97985468530.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/vevogoferavezamuz.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/69183524482.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/31046716181.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/6029881157.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/80544537109.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/fafanez.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/vilopu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kojogukevubijaxo.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/tanebixugejijediruwukedaf.pdfIn PDF document text
    • http://mfahk.com/upload/files/71143512578.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/wetesidumedopuguxes.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4d5d6d6c---48692018924.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zivakubebatalikabaf.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/nelolojaroginexisuku.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a21639ccc9fb94271a6033d17e619ba/ludatifuzevirafowa.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/44420942855.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/84559904404.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/88424799736.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/zexaxujojituxilob.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vizidusodebafibedesujid.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/zimonerowubinuluxewavebo.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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 18724 bytes
SHA-256: 8600e7bab2734be22a8d783e0808796f347ee4fb05cfd5b1993fff81277e64e7
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 11164 bytes
SHA-256: ad4ec8d60367444700b70882843ed0b63c02fbd5e6ff7cb696cb50d85dbc875e
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1