Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9481d35d36defa4…

MALICIOUS

PDF

96.0 KB Created: 2021-03-15 17:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec52028a2eb0ba08d7f0333a2eec4484 SHA-1: 536bc7814dfe9fc3033c63984e99cd388ea92508 SHA-256: d9481d35d36defa436fa635ac3dc87fbabe305b782ec98f1ec468ae73209ba43
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=black+hole+theory+in+bengali+pdf PDF link annotation
    • https://nixotebiwozo.weebly.com/uploads/1/3/4/6/134667174/caacd072faefcac.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/xaxasotuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_603d4cd414782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fdc6cf2b579b.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/fogizole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_601fd8c339ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_60188a2568209.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/8de64dd3.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/62374a5511ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_602d7158b5b7a.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/lidasevaxevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fd0ea5189c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_603283accc4e5.pdfIn PDF document text
    • https://xubajibagi.weebly.com/uploads/1/3/1/3/131378916/xutexapuzi_rapexiwasapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3efb74-68d1-4215-afd3-698e2ab5fd93/andrew_ng_recommended_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed9f45c-0650-4ca9-acce-76ac4eb904a6/59641178188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809f727e-c077-4e44-91fe-d329578bbad1/how_to_update_zoom_h4n_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c02c3c-f3e6-4052-8a1b-1ead32e34163/zelileke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567d9f5e-73fa-4afa-b3e1-f2d566cf8398/darren_hardy_sunday_planning_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177847fa-9897-4c23-8cf6-e14307fc011d/nikidezujezatewuluk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5596 bytes
SHA-256: 435b66c34917a3ef1cc0e8a09cb90fa78a35c74f2b087a60ee0b8a8634d2f9a2
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 24928 bytes
SHA-256: c7968e4e8fc08a868a77640f27fa0ae785604a33eec390bf0ce7babcb2ef5988
font_02_sfnt_off00014cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 10208 bytes
SHA-256: 7b0b11835a2bb95a85025013a5f993b609c4e7d9f7e9594ff6fc518b925bb33a