Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dff539df1e992ce…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 12:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c36b0e0adea8bd4321d7675df877fd SHA-1: 8b33e04b60e9795493f75906827c3f71dd6c2052 SHA-256: 4dff539df1e992ce1a9688f0dfd1726791e3247cb7b4e268170a681760302eb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to obscure the final destination. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://damutech.kz/upload/2021/09files/210912230334743128jrjgw.pdf In PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/12326500721.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lemumatewiluxekowip.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/suvozefuwo.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/14502679127.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/50328112296.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bazezirafulodamim.pdfIn PDF document text
    • http://sakra.sk/storage/file/17831506316.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/zuwabonexiniguvasuwukawov.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17635625998.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/18382038159.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/37605530913.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/39338605576.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jumapodidumuliratovipevop.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631377855.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/jopuniwukibo.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/93888694566.pdfIn PDF document text
    • https://fototipia.hu/files/files/31924921799.pdfIn PDF document text
    • https://kawanmto.net/contents/files/fukoxoxumoruxomil.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/72439649009.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3053f6d8---dakekoso.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/zulesiwitekemulenorup.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nobatazum.pdfIn PDF document text
    • http://evola.it/userfiles/files/dezegotilobowe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65839055720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+fix+a+computer+crashPDF 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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 10876 bytes
SHA-256: 0c3356cf5ec69317ea77153480c1b4e4b8704efa85fb3d25f04dd30aff9e8ecf
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 17676 bytes
SHA-256: 8f8249130ba3eb51f13ca9efb8dc362cf69cdd7c0cdb4155879e930efa264c9e

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