Malicious PDF — malware analysis report

Static analysis result for SHA-256 400577fdec650180…

MALICIOUS

PDF

121.6 KB Created: 2021-05-31 02:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcbd486f7feecf5cb18a99d29b4988fd SHA-1: b295aed5a545912524a37af154bf7030beeb299c SHA-256: 400577fdec650180124b4d9c7a88bd09f823960ef042936e9b9adfdc4542a1eb
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 0.9972

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://xezojetit.ru/strik?utm_term=full+form+of+c+v+in+hindi PDF link annotation
    • https://jogosoti.weebly.com/uploads/1/3/1/4/131453036/7841097.pdfIn PDF document text
    • https://lijixavin.weebly.com/uploads/1/3/4/5/134598275/215600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_6052b8edd0e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602741853c23c.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/6439898.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/dukaxanobixupusot.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/f09b930e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5fcd89e184978.pdfIn PDF document text
    • https://wuwepila.weebly.com/uploads/1/3/4/3/134371533/4719727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_60671a1ce26d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454164/normal_600219cd1f09f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369901/normal_5ff7c4427e10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_603cbff8801fc.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/74d37fd882a8629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fce987467a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5fe77962d63a4.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/5965918.pdfIn PDF document text
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/koxopiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/8faa1438-9cef-4430-b014-ec3c9d0276a5/vinayaka_stotram_telugu_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b28673-d3e7-4149-b7e4-80699769536e/30774499049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9843644-64ca-46a0-85ae-39904b2eb308/sql_server_2008_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92810092-e083-4bd9-b560-c5722555d665/could_life_arise_from_nonlife_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7927eb-d915-482d-b134-495e1a0846fb/fifty_shades_of_grey_teil_2_netflix.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D4 4572 bytes
SHA-256: ad4a44af585dda9e25679d3d8c3ab0095eb2c6546d03dee88eb4a78bb377d471
font_01_sfnt_off0001641d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641D 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00016f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F80 10424 bytes
SHA-256: ce7dda2cc125c63998803b83a4129217af9ad3f499d862f6004f10c66b7f29fb
font_03_sfnt_off00019302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19302 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_04_sfnt_off0001a102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A102 18196 bytes
SHA-256: 27029b5534551aff0211cec63df0d68570f454b82862f093fa3930c454487742