Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4add517f254d39…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 20:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53b370d1c62f89308bbe0dd9e4fb65f0 SHA-1: adba16c00acd60386e52bedbd4b62762ca373a4f SHA-256: 4a4add517f254d39fee91b82ee97def887db754ad9bbbad332b609377aa5e168
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to obscure malicious destinations. While no scripts were extracted, the presence of many unknown URLs points to a potential download or redirection mechanism, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adaviestransportltd.com/userfiles/file/42569601782.pdf In PDF document text
    • http://murasakijr.com/uploads/files/48303192538.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/nakatorubexatoxonebifebot.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2a90cd53---nezomizizuzu.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nevoribunalipikejikido.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/pavimadiw.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/97526044444.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/7120738470.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/zelabedoxidire.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/88008554589.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/gatoxitepinufevib.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/66381659380.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sukimukojikope.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/kagubififitevamilawenotev.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/gevowezumidumi.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/totoxidi.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/45932669217.pdfIn PDF document text
    • https://bloomeng.com/uploads/besewob.pdfIn PDF document text
    • http://chenruichem.com/upload/files/88196230668.pdfIn PDF document text
    • http://etnorom.hu/pictures/70547577694.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/73167902897.pdfIn PDF document text
    • http://merwepizza.com/upload/file/67756076698.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109200047019926.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/11318894812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+booster+apkPDF 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_off0000b961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 10520 bytes
SHA-256: d6cd9bc06ba83f2bd9a71fe69aae12198464016709fe2b0f418eaa42588a2fb6
font_02_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 17452 bytes
SHA-256: a629b2ad061e647404c771b95e72d525fc14f0ff6c7778baf11cb66a7b90a794