Malicious PDF — malware analysis report

Static analysis result for SHA-256 0278aa158ce1fd46…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 12:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0417d2643a355bf8c00c3c51c82ee7f SHA-1: 7cb633b67116f22811991591a8d51476531d4f94 SHA-256: 0278aa158ce1fd46e8203f85314cedde760bb9660b19a1e5bc3f9d5636f51a86
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, presenting itself as exam papers to entice users to click on external links. The presence of a large number of external links, including those pointing to potentially malicious domains, strongly suggests a link farm or redirection scheme. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=jipmer+bsc+nursing+entrance+exam+previous+year+question+papers+pdf
    • https://cdn-cms.f-static.net/uploads/4392474/normal_60253f6c6d0a9.pdf
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6046356586a02.pdf
    • https://cdn-cms.f-static.net/uploads/4413845/normal_601f646f81047.pdf
    • http://hookup682.site/9118024715apssy.pdf
    • https://cdn-cms.f-static.net/uploads/4376127/normal_6041ddbac6554.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_600deb4f348cf.pdf
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/gijezapuk-kotekifamulo.pdf
    • http://siluduto.22web.org/chemistry_the_periodic_table_worksheet_answer_key.pdf
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/bekafamututewimonas.pdf
    • http://circulshtangcalip.website/lie_nielsen_honing_guide_reviewaw81p.pdf
    • http://creamwalls.online/corporate_communication_a_guide_to_theory_and_practice_5th_edition_free37lcs.pdf
    • http://lakulikelanu.iblogger.org/difutoren.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tafogusegabomu/fufes.pdf
    • https://s3.amazonaws.com/lixisariwulo/jenaragojuro.pdf
    • https://s3.amazonaws.com/werowibovezoje/25040368186.pdf
    • https://s3.amazonaws.com/nijosinizo/sijorazufum.pdf
    • https://s3.amazonaws.com/pirofopafu/gitoviwupezizijepejonor.pdf
    • https://s3.amazonaws.com/turip/54535652304.pdf
    • https://s3.amazonaws.com/xutomoxu/zanebuzizegirotoxopaped.pdf
    • https://s3.amazonaws.com/likerajatob/rimas_y_leyendas_los_ojos_verdes_resumen.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_off0000e5ca.bin
e2e187e0f86a194c35c2b3886557d2c144f2ad9b96c847f29447d84400e8db83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 5928 bytes
font_01_sfnt_off0000f9de.bin
b978db180f1cee783ad854575b386b771bc80a51befb1f105316604357156ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10816 bytes

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