Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b73e358ac1a6b9b…

MALICIOUS

PDF

97.1 KB Created: 2021-02-19 19:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3aded0e127c39b42eec5229105bd4652 SHA-1: 99be76f3f70750d582a5a9dc831fd4e672420c18 SHA-256: 6b73e358ac1a6b9b3c6f7f284c41b88fe1ad416f2b6503d97547f6971d5d56e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=does+hdmi+support+120hz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422373/normal_6004c18469477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_5fe498a5edd92.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/d988822.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/zibeganef.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/4866297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fc80b9f8b882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5fd116e107ae9.pdfIn PDF document text
    • http://basvuruizleme.online/97163370383kox4m.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/moyer_administracion_financiera_contemporanea_descargar77ank.pdfIn PDF document text
    • http://onesmall.space/alcohol_120_full_crackblgay.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/ee6d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogizun.epizy.com/bushido_blade_2_psx.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/55983597826.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 5332 bytes
SHA-256: f29fc58de1ecfa0982386b7a459d3a85339bcb4df33b9b802134642feabdcb84
font_01_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 11508 bytes
SHA-256: 642485dcbd1f9457a3b08ec13dfae4d70714adccfea93c7daa675ee0ce384185

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