Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b7bdbf2a3b845f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 13:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c21c87896db2bc8c53e3560aaba88952 SHA-1: 25acc8b5e98d29e11d217abb03158dec3bd7a26c SHA-256: 70b7bdbf2a3b845f3a557f00234d1ab97569ba1442eb3befcd2389456aa2bc06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards exploitation of vulnerabilities or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gldbirdgel.com/user_img/files/39434812264.pdf In PDF document text
    • http://st-ark.it/userfiles/files/vulidajixirajozetix.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/tutukexazusesaberosajib.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/ludutejesorafogurivu.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/98916829526.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/37891340108.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f370c16740---temofurat.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/33918280361.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/jinekugojove.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/36987140635.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/nepexufatanamubezula.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/68548198337.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134a18e115c6---xugarifimukakoveweji.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/romesaxeki.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/kokamomom.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/fobunamezadetolotimisonoz.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/22327409611.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/97921595204.pdfIn PDF document text
    • http://llux.vn/uploads/files/44740564946.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/44753339019.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/87311985099.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/3997884427.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/96803812372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+merger+free+download+full+versionPDF 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 18328 bytes
SHA-256: fa5b8658ca94c68be308139b58fb549a96dacf853199f5f39d4891df6104420c
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10852 bytes
SHA-256: edbc1855c34734295a40f8c9f1921e4e13cddbd0496c7bac36b51d9e8f5f3d4a
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1