Malicious PDF — malware analysis report

Static analysis result for SHA-256 5738040fa58c2cb2…

MALICIOUS

PDF

76.1 KB Created: 2020-11-24 10:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4390de9d58973df32f13bb082ce5db94 SHA-1: 1c222b9a0c3313f705dd9623155e1c6f291b6644 SHA-256: 5738040fa58c2cb2bc4c3edcf55e0d2ea5691c9970c948b9730422961e3ea97f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a tactic often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://trafficel.ru/strik?utm_term=gender+race+and+class+in+media+5th+edition+pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/8c1ce2929f2f.pdf
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/zuwirebomeborozimexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e88fdedc-e157-46c9-8709-d2b10058e762/jopokojawaguk.pdf
    • https://uploads.strikinglycdn.com/files/65b87037-ee0d-42f9-a316-4dcc410de1c2/47795329560.pdf
    • https://uploads.strikinglycdn.com/files/4b84b96c-7e7c-4491-9697-64f87afa0211/zalizopajiwo.pdf
    • https://s3.amazonaws.com/waxapoz/pogoda_angielski_wiczenia_dla_dzieci.pdf
    • https://s3.amazonaws.com/posufij/duties_of_a_pastor_wife.pdf
    • https://uploads.strikinglycdn.com/files/dbf3c0a1-396f-4d1e-8b89-0915b2d3a12b/87826257879.pdf
    • https://uploads.strikinglycdn.com/files/c4da3265-f095-408f-9b41-ee5ae1883dbd/pepewuxekeluxenusude.pdf
    • https://s3.amazonaws.com/wunupalezozerud/la_paz_de_dios_este_contigo.pdf
    • https://uploads.strikinglycdn.com/files/df7c863d-147b-4b4e-b6b6-612a344be206/jiwurelenisabirume.pdf
    • https://uploads.strikinglycdn.com/files/54506721-8944-41f3-a805-3dd0a8a45c51/difepaporebebinaj.pdf
    • https://uploads.strikinglycdn.com/files/c6abe7f7-160f-46c3-8d40-6314170a2a3b/temelukezizifobof.pdf
    • https://uploads.strikinglycdn.com/files/a9772570-2dd1-4ee1-a439-e3843ef54455/nememuvusil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27c.bin
da09a3c712916f5cf868db132366a9baa11e2e83f845ac85067bd3ef41eddc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 5548 bytes
font_01_sfnt_off0000e536.bin
85d3c076a6da9e604c260df35b4a9bc2bfe5c841614a14dce48707c96794bf9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 11100 bytes
font_02_sfnt_off00010ae9.bin
1645d83c3653bacc74a03631846782f3088603bdd6163b06366f45fe2236ece1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16892 bytes

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