Malicious PDF — malware analysis report

Static analysis result for SHA-256 800475d7bdb88d15…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 00:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8df7399138938f3981dbf60fbee745c SHA-1: b4e6459414b330a52da3332ef67570b676ebe2b8 SHA-256: 800475d7bdb88d154c7fcef55e6a49289416fad6ffbc213bb2411618828125d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this being a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=poco+x3+screen+recorder PDF link annotation
    • http://stylekd.ru/files/91352051505.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912201026773319.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d401b061ea3876f045913025ea557db5/85984698869.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b2d00145---69092708776.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/96737198785.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/burupegiziso.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/ritazapixepaditomibewini.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/bajekatipaxa.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630973252/files/64060021316.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/9901280856.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/67094888253.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sutujonigegidasiwazurupe.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210912035542.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nozatejiburepom.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/dofuvakeb.pdfIn PDF document text
    • http://novichiha.ru/pic/file/damibadibamedinumewemiza.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210909_46B61275192C2E11.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/saradafedapubil.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/43474767549.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/baliwepojolapumawe.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/xulurupok.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/90087420205.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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10240 bytes
SHA-256: c7987f2b9749d571a6b628030573fa9a0d0a674438666403d153dbda843e1df6
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 18168 bytes
SHA-256: 257e337cc7a1cece04faff646f259bac3d79bc71d5b1b9f0f1b915fcee3856b5