Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5699c19f8e287ff…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 01:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 44a9d2454d7c38304f6c02402dffdaa0 SHA-1: 3ffadac4f31216a6736d14147f62e690b4b27f03 SHA-256: b5699c19f8e287ffa05f4f5042db869e88e9976c0c0e85cb44f9cbe3566a5a7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious content.

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://druttle.ru/123?utm_term=devil%2527s+bible+book+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366382/normal_6021f8884c66f.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/rebiru.pdfIn PDF document text
    • https://modizotu.weebly.com/uploads/1/3/2/7/132740501/434985.pdfIn PDF document text
    • http://xomuxurek.22web.org/43831893981.pdfIn PDF document text
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/6023268.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/5483322.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/aghidih/zulubup.pdfIn PDF document text
    • https://zumusikibalagop.weebly.com/uploads/1/3/4/0/134096359/kagopazuraribopinum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60318c6a1288e.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/gfjibqx/podumijegosejo.pdfIn PDF document text
    • https://zamigalimigarub.weebly.com/uploads/1/3/5/3/135326483/vufoduzuzobero-bujifonerudo-juzejisivepas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/73575129850.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/joromezofabo.pdfIn PDF document text
    • http://patabajisof.epizy.com/51064375071.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/spc_format_in_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/lunekubos.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 4672 bytes
SHA-256: 14439782c539cdf9e25a67582716ef68142e5ac1a57db5c174aa0ffcca962b61
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10936 bytes
SHA-256: a5bb061305582f1a0bdd7dae327e5364c37916dc3eefb7b4b7f7225fa58961e3

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