Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cf608db12fc9c1…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 21:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 292d7c328138048efd91fe0e37a32486 SHA-1: 32d818c1d7775eb89fa764d33707825e56d1ec07 SHA-256: 27cf608db12fc9c1bb16d8355c015c67afeaa40bdde775d1facf5ae72439d703
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation designed to redirect users. While no scripts were explicitly extracted, the presence of numerous external URIs and the ML classification strongly indicate malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=bestiario+julio+cortazar+libro+pdf PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/83007519830pt72b.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/bij24Gp/pododedimidoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_604ae8d3ae18d.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/Kiievjc/didabefivikidoxari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ffe160c2ef1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_600355124fb54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/terzo_libro_argonautiche.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_2c32a87ed4f54ab590424ced620f37df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a04178-7506-4242-b991-189d43cfc5c2/haier_hlp24e_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/76611250319.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_a4157a49711a48aea2141d71965a193e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf234f9f-659b-4ef8-a745-d49e1e76cf84/v_for_vendetta_comic_vs_movie.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_8964c23c1e774366bb478559b131b1e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac31b6e7-3512-44b8-9660-6ca08e5d41d2/75669730962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04239614-8c14-4eef-b8e1-2cc95a07640d/doririxuvazuwapi.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_4d9f442ee30447cab2a77a7297b645e6.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 5464 bytes
SHA-256: 8f72c1622ec4fbc679140539d8592261442e715b072290193254a839d2fc5467
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 11912 bytes
SHA-256: 73b998c960e01ffec1a39c22848c4db3b97f818ffb1db9eabbeb604e094ba6fb

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