Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3097e0699a94791…

MALICIOUS

PDF

77.3 KB Created: 2021-10-18 08:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9b4627e5622bf4aafd5b46bdb09add3 SHA-1: 414948d851df8274a299aef54c90710e7a4d9d15 SHA-256: b3097e0699a94791bff26f4fa8b831f0f27051b3d3ef96fb0bcc0e1ff878390e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious files, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hospitalityroyal.com/upload_files/file/vuwagolusezijekakogevado.pdf In PDF document text
    • http://ruihuitax.com/files/file/pususugojori.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/85664821247.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fb8750dd---jusodu.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/fubij.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/wuxifodomaboba.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/57984970103.pdfIn PDF document text
    • http://iltorg.ru/upload/file/lojarigavogewekivepixi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/liwuzowiwina.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/54141411742.pdfIn PDF document text
    • http://citty.org/images/uploads/file/nuselojuvusowuwi.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/11484773699.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/depogojegelepi.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/83599363363.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161304a0505ba5---boxapebubevonak.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/nasodonigapirasupewo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/memerakemegirewifi.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/4570839811.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74569928783.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/folebawofarijiwine.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91324843796.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/53037977029.pdfIn PDF document text
    • http://ccadl.com/files/20210909095047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=in+the+line+of+fire+pdf+free+downloadPDF 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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 19272 bytes
SHA-256: 5a811ced7b050f8336998e5d3c9cc63c8fed1d5aee1746d9b057d66b4eda1db0
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 10464 bytes
SHA-256: 6334087d70eebbd0a1a5911839263d8bdc821ea6614fe5ca90dba78f98744925

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