Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc18aa580d74e68…

MALICIOUS

PDF

80.8 KB Created: 2021-06-09 08:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 802adacf8dd4ba4e4549e27dd885bdf6 SHA-1: 3c69a92b6a9a1f9d8c742578f6b3ed39b13da4fe SHA-256: 2dc18aa580d74e683eb5da53af6da2b4d11c9308a055f117297ca27c68412739
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/pbw?utm_term=mad+battle+royale+online PDF link annotation
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/zikakudokudi.pdfIn PDF document text
    • https://wulukapuw.weebly.com/uploads/1/3/0/7/130740123/4382931.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/170147ae03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ffb8cbadade9.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/fawerejireru.pdfIn PDF document text
    • https://rufukowov.weebly.com/uploads/1/3/4/6/134665675/7733113cc8.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/a3193d71795abd.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/xuganozo.pdfIn PDF document text
    • https://gulukuse.weebly.com/uploads/1/3/2/7/132740430/45be2faf420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fcdf9a745b0f.pdfIn PDF document text
    • https://zegepami.weebly.com/uploads/1/3/0/8/130874110/2013996.pdfIn PDF document text
    • https://rarowovi.weebly.com/uploads/1/3/4/6/134664267/9719796.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/mibopizuvavidufebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_6066ea907fc3c.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/juxomewapuxuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffe2581bfea3.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/0c9bb2c00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ea106d-d9dd-4be8-bb34-7e176f8e99de/38288736909.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144763488/10905974459.pdfIn PDF document text
    • http://kobowal.pbworks.com/f/luzufiruzewitexixivaba.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413490/rufegosij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af35dcd8-0ee6-4f64-9615-f56ab80fd4d6/40756957618.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/f/muxuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf56de4-c568-48f7-bbb2-ae01ba49f9f8/comptia_security_study_guide_free_ebook_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 4888 bytes
SHA-256: c53ccaabafbcba274fa5c1a5c0bbf15b32bb6044f07a05b7fc726126f52c284a
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11132 bytes
SHA-256: 94080f3ae63afa6fa414c696e189209e9defa8add6d2f3fe281a54b0f48ec457
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16988 bytes
SHA-256: c9165d91a66fe7a602a8b57c53cbd1a33feaa7f7fbb2b9966300383f53b8495c

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