Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c684436697f1b5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 05:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30ccb8b0936f94930b081262d8f06dad SHA-1: a4362969ec54e4d34c5b1d08e58310f779457110 SHA-256: 65c684436697f1b5b471fde6b110011034c2ff2a67f5136e1473ee9328ac5235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, directing users to numerous distinct hosts, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://calprin.com/ckfinder/userfiles/files/1285786839.pdf In PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/futitokekebipujik.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/wolurufor.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/ridoxenitodugixamak.pdfIn PDF document text
    • http://floramarble.com/uploads/vomegarelavolizovu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/46119617725.pdfIn PDF document text
    • http://mylodge-naoshima.com/24173006558.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cip5aqauk2qhki6tu3eppultp9/62612887204.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/69245027019.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/xamiwisopisolevajaj.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/95070391077.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pekoxojot.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/60606346135.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/mavaxipujagudefekajatiju.pdfIn PDF document text
    • http://hk-keber.de/images/file/vavizevare.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/26363401461.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/88656093990.pdfIn PDF document text
    • http://vaynhe.com/upload/files/27068748595.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/27074434430.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/vewenebimevisuvusopud.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/94352148865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=we+have+always+lived+in+the+castle+book+pdfPDF 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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 17208 bytes
SHA-256: baf37dc2ad132943b1b5e8e7556f15229a6de0aa8f89b362b8f009c4fc95d4ee
font_02_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 11108 bytes
SHA-256: f407852ff0363d07e6aadc9ff5468909507e85ff0225ed41f3ee30cce5113cc3

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