Malicious PDF — malware analysis report

Static analysis result for SHA-256 431b4fecf5d75b5a…

MALICIOUS

PDF

75.0 KB Created: 2021-02-21 03:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95573a35737d023ee86295cede1adf2f SHA-1: 44809c9841815291ef55863a5ff0c3c164256074 SHA-256: 431b4fecf5d75b5a1b815f80614b21c95af196a4560fd0a6e9e69d4a9add69e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external URLs points to a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=kenmore+500+gas+dryer+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386086/normal_6012093506937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_6025dfccda60f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5ffc717d7d650.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/jemusasojubinepis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_6013ee78e8270.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/b8hjhiF/42156606024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_60228e6e08c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5ff531caf1070.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/cifkhjB/ambulance_siren_sound_effect_free_download_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6025030ca8dbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fe5faa399eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fdae8633557f.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/eihOl6P/24137602711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5fcdc9011e027.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/Zl0rhhg/civil_war_ducks_vs_beavers_tickets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fea360425a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_600f04013bac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_601dd1d7b1bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fd78ed66852a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fffcdfee1bbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5584 bytes
SHA-256: 4fa1dac7479d3e1208508ea7dd49daf96f2eff6fa6907aafd1fc309e2c188b17
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10884 bytes
SHA-256: 0ba12c33aff3193b256e90f184103f4de128539f0e7496f019aba85fc80347d7

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