Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b38cd8ade577873…

MALICIOUS

PDF

68.5 KB Created: 2021-03-19 09:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 401c11215c1a682c63980bac58e8d9b7 SHA-1: dc667985b8261c6f658f90a8173c62cba4c98d60 SHA-256: 8b38cd8ade577873fed872f6c3d193dd649d85b22acb2cddb0fbc75b8ca2cb3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The document contains numerous external links, with the primary one being to 'ponafet.ru', suggesting a phishing or malware distribution campaign. The presence of a link farm indicates an attempt to obscure the true malicious destination or to generate traffic for SEO manipulation.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=malayalam+kambi+kathakal+ammayi+amma
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fdf81690f63f.pdf
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/vitaluzorobafafuzux.pdf
    • https://cdn.sqhk.co/tiniwakutosu/egfbFFk/ocotillo_cactus_pronunciation.pdf
    • https://cdn.sqhk.co/zimopaji/i6D8vjd/taz_wig_closet_instagram.pdf
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/c4ea14bfa03f.pdf
    • http://sebevifa.getenjoyment.net/pdf_botanica_organografia.pdf
    • https://cdn-cms.f-static.net/uploads/4452850/normal_601b8d82aba96.pdf
    • https://cdn.sqhk.co/tejikeluz/igk9b1p/slither._io_mod_hack_apk_android.pdf
    • https://cdn.sqhk.co/jivazufevi/idMgeOf/geometry_dash_online.pdf
    • http://zikewexer.scienceontheweb.net/naxasexutor.pdf
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/d35b25b52f18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c732ebf1-b90e-4f23-adaf-4522d6d9b1db/goketo.pdf
    • https://uploads.strikinglycdn.com/files/74f3001a-0636-407f-8415-90314e2f6951/sinatisozatupenedowup.pdf
    • https://uploads.strikinglycdn.com/files/8a3f1b7c-871f-4cb6-9d98-8975ad05894e/how_to_charge_my_jlab_bluetooth_earbuds_case.pdf
    • https://uploads.strikinglycdn.com/files/ea8e5066-5672-4e25-9667-50bff15af665/48029040760.pdf
    • https://uploads.strikinglycdn.com/files/f00804bf-8fec-4589-9320-a62c74820507/22458658524.pdf
    • https://uploads.strikinglycdn.com/files/0c89a5e2-d170-43d5-822a-d4f37b5865f1/loxifudivavativuwuna.pdf
    • https://uploads.strikinglycdn.com/files/6fab0d65-277d-4889-bcea-e39d383424a0/mabikufexave.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_off0000cf9e.bin
d18683ed90b6b6bfc71e25db69387a352e9a2612948c095b282997a18b8ec25f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 4960 bytes
font_01_sfnt_off0000e070.bin
6310c0f3ae6dc5f4317f222eb7d4e201407cfb8617bc43c14b8d760d2e8e5247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 10088 bytes

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