Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4619d0d3be7716d…

MALICIOUS

PDF

69.5 KB Created: 2020-11-10 01:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3860cfcd6f583719b4f9bd9fdae7d2e0 SHA-1: 747679bc2d30b4d316668b60459989d435b91b1f SHA-256: d4619d0d3be7716d3483162e321e679509fd7d4102619916cd7f42399332ee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic specifically points to the creation of a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily corrupted, contains text related to 'Bible in 90 days audiobook', which is likely a lure to direct users to the malicious URLs.

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://trafftec.ru/strik?keyword=bible+in+90+days+audiobook
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/184500.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/9625103.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/xiriruvumojupax.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2386540.pdf
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/372071.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/xeziganas_kubibowoteb_tijofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84f7eacf-9436-42b5-bee8-acf4c00f8e36/vibupakagepefo.pdf
    • https://uploads.strikinglycdn.com/files/e3aaba11-158e-4358-a8e2-901fb9e5e88f/lenguaje_comun_a_lenguaje_algebraico_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/a0efff48-1228-4f14-8818-f46bc340b02b/juxinotobomo.pdf
    • https://uploads.strikinglycdn.com/files/1a304c84-5df7-4353-b0bc-f2c574e67fa0/44652469423.pdf
    • https://s3.amazonaws.com/baxegezivumi/14062015763.pdf
    • https://uploads.strikinglycdn.com/files/a751c6b5-e8fa-46af-b1c2-a83626b5e2af/sitixegukufufa.pdf
    • https://uploads.strikinglycdn.com/files/7ae8973f-6531-4a64-b772-905e94a5b80c/talcott_parsons_aportaciones_a_la_sociologia.pdf
    • https://uploads.strikinglycdn.com/files/5e3ea27f-2001-48dd-9d5a-8c1cf0a25274/lasidoxuwob.pdf
    • https://uploads.strikinglycdn.com/files/8da295a7-8f7a-472a-b421-de7d2b022923/71366209944.pdf
    • https://uploads.strikinglycdn.com/files/f6532a54-08c9-4029-a478-2c817eb4eb69/gizazelevexawiwopopikam.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_off0000d2e1.bin
994d9b4c6893b9fe6f1a1e761c9ad2a1774bf54bcc9ddff9a07935aa10f9b6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 5376 bytes
font_01_sfnt_off0000e540.bin
7c5721f7809c11b4ea8eb4d4b97a4578a141e3c8550a85352696028e3db558d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 10540 bytes

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