Malicious PDF — malware analysis report

Static analysis result for SHA-256 677fcb9879a67f89…

MALICIOUS

PDF

73.4 KB Created: 2020-12-23 08:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 74e3435de2a37a5ff2f45dc455a9e937 SHA-1: 65d3f551a61f49b18d67886a840a56e544bc9a4e SHA-256: 677fcb9879a67f89e8e906d9d719c405fb4852af909a3c7471a9fbbe98869d35
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, one of which points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be corrupted or intentionally unreadable, suggesting it's not meant for human consumption but rather to host malicious links.

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
  • 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://traffking.ru/123?utm_term=mannitol+mechanism+of+action+wikipedia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fa745080d037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5faa0c28914e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_5fb2f2eb8a89e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd71a70a0bbd.pdfIn PDF document text
    • https://joginogi.weebly.com/uploads/1/3/1/1/131163620/jagefosuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f90b315c20ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_5fb5a90a172c5.pdfIn PDF document text
    • https://varodapomibaga.weebly.com/uploads/1/3/4/8/134874415/nuvazoxugu-xipedazekuwekog.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/9e6fb4b2-2090-43f8-b7b0-6643cf60871c/gadoxotubotonozexebomi.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/glen_waverley_school_uniform.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2c445b7bc966055df433/t/5fdde0b2459323513bbe130d/1608376499408/motorcycle_aerodynamics.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/32599522604.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52d2ebe9b69395126b4b8/t/5fcf493476f3eb1a46e05250/1607420214514/jawinikaribebubidume.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/70457850261.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 5460 bytes
SHA-256: 2d39834969395003ad87b808f32d321b57cf15bef23ef7eb113bdbb5f6f1a84a
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 12644 bytes
SHA-256: a00017ebf9ff62220f17f8020004a81e9638753e31bd5c72b4b6c01bae7ed0b6

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