Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca8c479a08d4ebe…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 10:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e4689d8eac693508991c41d73af6341c SHA-1: b265343a56ed3415780a48e9e4d237ef40d159ba SHA-256: 9ca8c479a08d4ebe5f6a4daabe43a72dd2033fc654efa65f7a9ea38c6f94412d
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 0.9992

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://xezojetit.ru/award?keyword=catfish+farming+handbook+pdf PDF link annotation
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/dipimegapirumufiba.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/82026165353.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/7b32a5f32f4bc6.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/wifumamokakivuwaj.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/vaporojanivemuganun.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/844741.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/fimetufovuxelawotel.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/curso_de_ingles_para_nios.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/how_to_start_a_home_baking_business_in_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawixojupaxixan.onlinewebshop.net/55517048661.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_feba94c4250147b9ae1d137bf45296e9.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_2645899319b2455db264dc898f05d053.pdf?index=trueIn PDF document text
    • http://buwifojozoziden.atwebpages.com/molecular_geometry_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/pt3_bm_exam_format.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/keviwisezazamasunivul.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/sukidumasaxoviwofoji.pdfIn PDF document text
    • http://jifimurosesapu.atwebpages.com/apocalipsis_666.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_00387b9ee3864e4981046df575e0c123.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_3717354ebc6d43a080a8e946f5d25237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/chicken_broth_dietary_information.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_d83c974a42d34abbb9a249c3b88b61f7.pdf?index=trueIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/gagunuwoxobikive.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/7498335903.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5532 bytes
SHA-256: 94590071f7758cde7cc22a2a01f6aeca838b5da0970cb96f45a6097f51cca25f
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 11136 bytes
SHA-256: 861e8211047fd5d4f0fee84a4144261f56233e2ce8799adbb4744e6cc4cf4c18