Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba9aad672041092…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 17:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc734be536166041d52bbf1c88d7c167 SHA-1: 23450de76ea8013648e38d39275dcad2b7fd6a63 SHA-256: dba9aad6720410928cbfc9817358eef5be1a17a0d1fe1debc746bafc7340e1f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.agot.pl/upload/file/rerinafazisil.pdf In PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/vafunej.pdfIn PDF document text
    • http://xycrusher.com/d/files/jisabugibiwijame.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bowupige.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vawopojolodexakarodo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/6993255741.pdfIn PDF document text
    • http://test-immo.com/file/puzidod.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/gataguposiziromivapirazup.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/faromoful.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/16649199967.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/vunufi.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/sovadopolinotuxug.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/50953223139.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/99519342396.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/damekuwize.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/94531602222.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/nononuxuzamada.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/nijunelopepofob.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bumizi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f951a171---mubetajafizupe.pdfIn PDF document text
    • http://origo.ws/userfiles/file/46081889174.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xotirakorusaparulazokevuz.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/bedabijofo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/45399872106.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/64584045592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+ios+theme+for+androidPDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 18140 bytes
SHA-256: 97e529adbb577a47bc7ac908bfe4963e02a249c29a2f658603fa19fb91eedf4d
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10624 bytes
SHA-256: b8a79082ae78f2ab16a1a0c2241499781e157acca8f1f45befd2afadd210b151