Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbf4421a295ef98…

MALICIOUS

PDF

74.8 KB Created: 2021-05-22 23:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b75583bd8dcc0a4f4641f7e3d113d3ac SHA-1: d54caed8fb87b68e1c007352725a5af82d0c9f99 SHA-256: 8fbf4421a295ef980075c95f7dc820f9d5db6e3ee12acd2401e6f7583108f76b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are associated with SEO link farming, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=johnson+evinrude+service+manual
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/dccc6c176d.pdf
    • https://zigudawaza.weebly.com/uploads/1/3/6/0/136035030/tovozosej-dipisofoju-sigedon-jivapukefil.pdf
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/kezoruwa-sotexizikimote-lexukebobubizus.pdf
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe081626a5de.pdf
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/c45411f6b6113.pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/19b7b4d2ce43.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_605a78858fd75.pdf
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/6740697.pdf
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5fdf2aec16f3a.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/7838013.pdf
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/zafijapuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomuper/hollywood_movies_hdpopcorns.pdf
    • https://uploads.strikinglycdn.com/files/f5c36054-f5a4-48a9-b4f4-8c23777638b8/kefoj.pdf
    • https://uploads.strikinglycdn.com/files/a543cdac-0303-4e5f-a2f4-40c34b314930/breville_smart_oven_air_fry_french_fries.pdf
    • https://uploads.strikinglycdn.com/files/0e722d09-df65-4819-8341-5832c7dd7141/45513493763.pdf
    • https://s3.amazonaws.com/sajatofubote/63332556333.pdf
    • https://s3.amazonaws.com/jozaponi/19081608000.pdf
    • https://s3.amazonaws.com/buxoparadazegu/twins_babies_images_free.pdf
    • https://s3.amazonaws.com/zuwosil/57864696464.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e752.bin
bbcc7367838b5109d8459c1ea089cbb60c8b988b7f7d65329548bfcf11ab58a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5228 bytes
font_01_sfnt_off0000f8f2.bin
30dbd3b784bc50dcd174d26b726e6cea80d636d3d1b3f52a0375bd58532bec33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 10892 bytes

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