Malicious PDF — malware analysis report

Static analysis result for SHA-256 085c30bd53ee4370…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba36c6f5fe262e4f99423343ff83cc5e SHA-1: 5950baf29c244807dbaa84ddd80aad35705478b4 SHA-256: 085c30bd53ee43705b8b03a661c6f637efb54c92d4e1a82978ee1153d0532549
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://ip-pharma.net/data/files/jenomozuzes.pdf In PDF document text
    • http://esipro.be/userfiles/file/vofuz.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/79965806025.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/54949439623.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pelipopadeturaxilaguzi.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/xazuvowasasutapozu.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/fuvuli.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/65743115109.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/ketogofujoxetobanativefo.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/68820088093.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/rotibilasul.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/kolar.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lumojefixubovomasuwezales.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/83040857377.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/43310314008.pdfIn PDF document text
    • http://wawa757.com/uploads/files/67842571323.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/pikemiminafadaba.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/dalizimeseramuwemojuke.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/91565501535.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcf9546d4---9596083449.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030652012390.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dekunukanaretafevefi.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/kukurirumowepukijuxogu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/15917398315.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+k30+ultra+india+pricePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/18810555150.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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 17056 bytes
SHA-256: da500f914c151d58ba2d880e0c20bed09637194e48a5322f3b01b3277ed745f0
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 10920 bytes
SHA-256: 70fa4aade702214aa9201913ca03e813a4792bd3fc7eaa8c14cde9b8bce7e11b