Malicious PDF — malware analysis report

Static analysis result for SHA-256 4989b34e7bea3fe3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 23:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e587e2d8cbf0ef4be733f1fc5ac91530 SHA-1: 86b11094adf9415461a6b8f9df0bf64487f6e9fa SHA-256: 4989b34e7bea3fe34ead1f1a689d1c4b7f0865da6280ad94744b95569bbcbb0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=mi+store+app+apk PDF link annotation
    • http://gpe-el.pro/ckfinder/userfiles/files/rizodexatixan.pdfIn PDF document text
    • http://prompol.com/media/file/7783856824.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/18231390227.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/13720697508.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/32967315485.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ja8v6p82h85udq0iat1c9srmf1/40752242104.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/81426892039.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210907084836.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/lojipos.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/30034814842.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902235044.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/14455538135.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/wegawej.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/lasiwuxurenozat.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/ropupi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/volepodiraduripotos.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/83553130024.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4f72604f---24248340258.pdfIn PDF document text
    • http://safetruck.gr/images/file/wadidif.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xaxubojoxo.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/67345382759.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/5823672913.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/26045293727.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/zuketisebisad.pdfIn PDF document text
    • 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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 15144 bytes
SHA-256: 5dd1412b94dd9d8f16ab2c84cf1d9cdb771372260d2a86bccd3059f8bc15d6cf
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10180 bytes
SHA-256: 53f21efeeab0689be43555f401480f508492617f81e4f099c9d882a9bb13d3e7

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