Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e84961afc2aeb5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18b21579f1e63103590f7cac2777d59f SHA-1: 0d14a877c2ef4892ee03fd28688d4c04cfd8897c SHA-256: 84e84961afc2aeb510fe1d38f6800f101b972b1e330efa06e9117b75a0f4c02b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cafepiolho.com/uploads/assets/2385629021.pdf In PDF document text
    • http://dmkert.hu/files/file/97254074940.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_4DE9E67D91A1F3B1.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/kafekesazijajufexobiko.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109131635359391.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63365686298.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb6e87d3ac51afbc2ba17402d79be0b8/81146286428.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xugolodilivufogeloto.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/23982369343.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/94155878499.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/wakamabawitafixijinesida.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/kipojizofugijasowepu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/6574766737.pdfIn PDF document text
    • http://royalgroup.at/tmp/pibewat.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/fakili.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/tulisovusilidawetoja.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/xomiv.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/regoxurajowivabug.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/7606049395.pdfIn PDF document text
    • https://kultmotor.hu/images/files/97165687799.pdfIn PDF document text
    • https://superpart.com/files/sikabegixidizafitinoka.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa73ebe9b---pibatekinevuvup.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73896609411.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15369999970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=douchebag+life+1PDF 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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 17064 bytes
SHA-256: 228d75fb81f0a4e48bbd24f1040d5e7e7ae307f4c3485bafda1a49de9dfd71b2
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10436 bytes
SHA-256: 70bf5afdb2b7282acc5dfa9059f3ed62b1afa0b2e592397b0c0e9bb6ec2dbc89