Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8d9acb1a18c712…

MALICIOUS

PDF

63.6 KB Created: 2020-12-16 10:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 87ea785edbb0c6f0d4266fcdb91df8db SHA-1: 7bd794d4d49862759bee5332cbfcb50eef10ec95 SHA-256: 8c8d9acb1a18c71262130314f45b5071226cbb3ec7f1aec27ecee894093332f8
214 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded links to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, with numerous external links pointing to other PDFs, suggesting a campaign to distribute content or lure users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=the+leadership+experience+daft+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f9a4956bf208.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/3956270.pdfIn PDF document text
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/933139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475715/normal_5fccaea079356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fb8440c4d010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495974/normal_5fb7d521c17ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5fa0ace1c9bbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/3049100680.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/88398630923.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/womobek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50d53c6229360ecc78f6a/t/5fd6d8df226e9048fac8e0a2/1607915743887/kawefapafinixades.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/vewagagadunewalel.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/ripilafuzixadulukaba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72b42778af068263d134c/t/5fcee65869d6d06d553254f7/1607394905224/parler_conjugation_present_tense.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/a_love_to_last_june_7.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6addd0a2757459b0b5f1a/t/5fcdeccd6f0099009e878437/1607331024355/fatal_fury_special_snes_vs_neo_geo.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_off0000bab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB6 5260 bytes
SHA-256: 4a88d4f523ffb6b67126af1247e7507e97644e8d116f071abd5d5b02114d538d
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 10900 bytes
SHA-256: 2b871b8ec4dc9b7007a9e2828a2bf20f89f4af6973ee95e85b664d8bbaaeebbd

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