Malicious PDF — malware analysis report

Static analysis result for SHA-256 419c46f3987a87c1…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 14:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e186197bf5b83adce7848d376bc0bf0b SHA-1: 2dbd3b3da37066a1d3a17c3c01989cd69b281578 SHA-256: 419c46f3987a87c190b1bb37288cf12ef73d5746b5bfa143c5c5a19b22a64780
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The 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 pointing to potentially disposable domains and structured as a link farm, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly suggest a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://softwaretesting.kr/club/data/userfiles/file/20210904173111.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/natozilopid.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/burexekomirag.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/92616362209.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/84439802862.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jojunezitu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/nogedusupunikopevafu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/89683126430.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c12036eb74---wexigumakat.pdfIn PDF document text
    • https://maisonforville.be/documents/file/bapabobolinovuwakisobon.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xuxol.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/tajedasewofopemutojaju.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/80056458320.pdfIn PDF document text
    • https://tuinvandecruys.be/file/janibegezubadanokalazopuv.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/werojuzilubejexafa.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/jebuz.pdfIn PDF document text
    • http://zimmerei-possert.at/39463195122.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/tiwifewogubetexinamib.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/50557117083.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/kikodebadizuden.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/pogoguzilur.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/22812041272.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/nomarovigakivegisu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xoxagetabik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ipconfig+renew+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_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 14100 bytes
SHA-256: ed8eb6dc151401fbfdbdd5484ab9f5f0c657c4bcf1d28a1e0b592f4bf373fd03
font_01_sfnt_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 10520 bytes
SHA-256: 0edd21c39d4c93ca90c07fa8cac958f36480b0527fc20866c4d2ab87e722ff58