Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ad2d7a7bf85c9c…

MALICIOUS

PDF

66.3 KB Created: 2021-03-15 09:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef35ca2cd2c7ef3e2349eb84968260cd SHA-1: 85fa9752bc4280db306ec94ad429f3fae1f7e1ed SHA-256: c6ad2d7a7bf85c9c3fa099dca9ad019c8849b5ee1b2900d42b9887b8253eaec2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=telugu+full+calendar+2018 PDF link annotation
    • http://kurekarer.22web.org/blues_brothers_album.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/a6152abd6.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/ada1e67.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/cbc3a5ac04.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/4e9cec7.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/elder_scrolls_arena_world_map.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/rijatuwegazowazow.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/jovevofaneniw_sopomiwekokofov_taronavuwomodil_benesezodu.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/fefakadu.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/5252890.pdfIn PDF document text
    • https://wavadubo.weebly.com/uploads/1/3/0/7/130775728/8400503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_f390a10ed10646c5b75e0e151558e01f.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_eb98e5bf3b2d48b0a15fcdf97f09f776.pdf?index=trueIn PDF document text
    • http://nukoxosexi.rf.gd/51524309415.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_3d9b1e85e0f54af2a9ed026d0d514508.pdf?index=trueIn PDF document text
    • http://viniwowosur.onlinewebshop.net/bhagavad_gita_chapter_11_in_english.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_7d5685897e5f43dcb46a980ea9aae85f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 5480 bytes
SHA-256: 61f2f6e980999eff11e24a58c2d7c3486938dd0cd9b9ba3f1a73238019166f2d
font_01_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 9644 bytes
SHA-256: 4085b4a991201458492a7912d4fa8bc20009ed191ec4f20b23b63ab83b9f60bf

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