Malicious PDF — malware analysis report

Static analysis result for SHA-256 523554bf71755248…

MALICIOUS

PDF

78.1 KB Created: 2021-06-12 19:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ea80f87449fd80a81cfe3ac4901bebf4 SHA-1: 05bf90cae19178784077d2ec17b10d7a167fdedf SHA-256: 523554bf71755248c3fc83bdd947bb7975ec736a412cadf9b05db32bb7627688
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links suggests a link farm or phishing attempt, directing users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

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
  • 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.
  • 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://huntic.ru/pbw?utm_term=manga+beelzebub+season+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fe9d2794dc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_603949712675f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6035fbb3c4f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_606208f037790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_602bf625dcb67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_601207b6ee64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_60c1e1160a4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_6039bf46395f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fe267e0aa2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_60683b5224458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_600eac33bddb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_606e9b302be72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_603c55d6eb9bb.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/nekugidetowajup_sazaw_ziluk.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/dikepigagofumovapipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_603076f999477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_6054c720a4745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_604197fccc008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_600ef51c46013.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491155/normal_60b00134f058c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 4272 bytes
SHA-256: be0a2a7104db5535377a20c713dbcca310def55aa6ca2bcab8bccb8bca0fe898
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 5084 bytes
SHA-256: 5493cdee3399661321299d3a76ebd3c604ea4fbf888be228493ca8709d976b72
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16572 bytes
SHA-256: 28c4ee370f524c2fdde39f278094364787f9e4a0d3a66dab103d36895b9f0c13

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