Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c10b8c91af720a0…

MALICIOUS

PDF

91.2 KB Created: 2021-05-27 23:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 916dd7c02b1ee156d8b9d4d6131f7402 SHA-1: 2cf43812afa43dc7ba9b0242c83ec0a4d1dc1c97 SHA-256: 9c10b8c91af720a06300c62d0de147c01250ee564085ec0fd458560e186da7e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary external URI, 'https://xezojetit.ru/strik?utm_term=convertidor+de+mp4+a+amv+online', indicates a lure related to online conversion tools, likely to deceive users into visiting malicious sites for phishing or malware downloads.

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://xezojetit.ru/strik?utm_term=convertidor+de+mp4+a+amv+online
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/farubi_jawoj.pdf
    • https://wuwonemuv.weebly.com/uploads/1/3/4/5/134589345/dodorikag.pdf
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/b2ba2b29.pdf
    • https://joxezikawatunex.weebly.com/uploads/1/3/4/6/134699300/tigokotasuguk-segita-lutelesumajo-xuseja.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/4953353.pdf
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/4d7dfe.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/4466992.pdf
    • https://xisedemagi.weebly.com/uploads/1/3/2/6/132681548/nisezesifa.pdf
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/6781915.pdf
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/kolomujobijug.pdf
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/2ad5b782f6dc72d.pdf
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/dipuwif_fumon_kumob.pdf
    • https://fovinerorowabas.weebly.com/uploads/1/3/2/6/132682717/009c4b518e25227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5d09e2d3-1ea4-48f9-9e4a-c0d88349acca/midoxe.pdf
    • https://uploads.strikinglycdn.com/files/74e3d1c5-7411-4425-9fef-70931ddd2263/44648288410.pdf
    • https://uploads.strikinglycdn.com/files/a367e987-ffa7-4a71-a514-f50fa1bdc410/roland_r8_mk2_manual.pdf
    • https://uploads.strikinglycdn.com/files/531660cd-75f5-4986-a6f6-93a63aafd583/wordpress_registration_email_not_sending.pdf
    • https://uploads.strikinglycdn.com/files/2700a5f5-3e47-4ec9-ba7b-52835efd91f8/porutagenusotosapidivemi.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_off000121d8.bin
6187d783395904cc34172f24cac8ea7947392e58870f78f4c334badb3636367b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 4980 bytes
font_01_sfnt_off000132b7.bin
cddeaec114d704666862d2b112ce20a5e9495ce1948a7511d594a66a0bbf49a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 15352 bytes

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