Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9531654fa87a2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 23:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e4ffeee3409e03194922bd28767f13f SHA-1: 3ee2dfe31d6da3ef26410b18dd296f65f016ddec SHA-256: 79c9531654fa87a2a85e57a5faa68bd7253d813c35ee5908532b6e3978fbc132
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/wix?keyword=naza+lite+flight+controller PDF link annotation
    • https://cdn.sqhk.co/buxoxurobewi/rggR2Y7/2871347743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_5fdd7748f2419.pdfIn PDF document text
    • http://vpntop.info/embriologia_clinica_moore_9_edicion3nvlx.pdfIn PDF document text
    • http://businesslinecenter.com/8_times_table_worksheetsahutq.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/ijhcuWS/does_rally_s_delivery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_600965cb71b6b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/Jhfjbhh/cheerleading_uniforms_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/wubejiwixu/g91wjWh/boss_katana_artist_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_60012ca7d007f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fd2defaad969.pdfIn PDF document text
    • http://comforfemj.fun/81248549725zdk22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5fde789865657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ff0944acc1a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5ff828cde69c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_f58e637ba0a5474fa7c65bd1d344be92.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_b0c1b61beaea4068a21e5308ecee4a5d.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_6f877033606c43f9aae26cbda1b10884.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 4772 bytes
SHA-256: 7551b49484d05fbaaf496aea923ef48f2debcad53830835c9a0f8ee5bc538999
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 12240 bytes
SHA-256: da283039e1dbaaba07e8edec332a8dae1fac10752679ccafc4e6c955cb7b40ea
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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