Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a973630c2d7b57…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 19:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c189f0c84b6cdcd29bb6b1dfd4038402 SHA-1: cb64eb58afb8dfcfee31c10d9754d7fa2f063cc6 SHA-256: 53a973630c2d7b570e714f9372407a86a74d7b3a1fb659ed69c8f0e9bc703bc1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It embeds numerous links, with one pointing to an IP address, suggesting it acts as a lure to a secondary malicious resource. The presence of embedded URLs and the nature of the heuristics indicate it's likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ormansagszive.hu/upload/file/74757612882.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/derobipedugebo.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/segowotosufavelorad.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kokifevenalolemobebitipe.pdfIn PDF document text
    • https://basisangka.com/contents/files/71003291952.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908155053_1533550456.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/zulixaximirefip.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16130757f08a76---64515305826.pdfPDF link annotation
    • https://futurefacesmiami.com/uploads/file/20467074259.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/64338236140.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_DC159528525105F2.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/ririlugebit.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/60548010007.pdfIn PDF document text
    • http://kme-kme.cz/files/file/68873802647.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/85841225615.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/tewujo.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/31989590321.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/44364109176.pdfIn PDF document text
    • http://test-immo.com/file/jamamalaxov.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/82266698652.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a1928080e71a03d990e39bc7d01b60d4/42541192249.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/roxujunabuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=organizational+project+management+maturity+model+%28opm3%C2%AE%29+%E2%80%93+third+edition+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_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 12016 bytes
SHA-256: cb59a3b476f0bcd14d7ad5dbc4c979dd49d752382d1296605df15867c0a608fa
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16108 bytes
SHA-256: cb32841561f67a1e184b9dd8998903ed514fda33f0bfaa2d2ea1b472de71c153
font_02_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1