Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b46c6e6f59217d6…

MALICIOUS

PDF

97.3 KB Created: 2021-09-12 09:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8eaea740722c8429e4a2b1b96e6b6280 SHA-1: e2d4d00739a80173c38e73784304379790ca886b SHA-256: 7b46c6e6f59217d6872f4a7791392354ae53df3d4d900def7ae76291d2eec3a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs, many hosted on potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://100gastro.cz/soubory/files/bugiwevew.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///508472572.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/xosowepowek.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/taroluwenepadibegof.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/gozowo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74983409552.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/97357002709.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/mozume.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/repolosujasonenolesidow.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/toxogejuku.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/narifetitosagimebube.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/93475241061.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/60894849964.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/munirawutejoruzop.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/49433109685.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/rapefibeputogamiremadij.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/70758862546.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/30790170871.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/bexuzobiwimanej.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/66661412302.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/31026900476.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zekosubowu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/19995209613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=one+tree+hill+season+8+123moviesPDF 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_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 18308 bytes
SHA-256: d11e430fe184600852ca2f6d2cc538772ff28ca0914e2b6c1a70f70938b836c9
font_02_sfnt_off00015dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEC 11016 bytes
SHA-256: 4aee425220050d774f66acc595ac54adc009d2b1a053ca23cb3e988a83f72a8d

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