Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cace99f8bff3f6f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 11:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 17745d75099b82a21271bb7e8aa5450d SHA-1: 155985bdadf0343c4afd605ff9697be074a5e5ce SHA-256: 7cace99f8bff3f6f659f687a3e06fc7da535f5ad3930a6bdf94748a7f844b1db
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 0.9996

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://midufefew.ru/wix?keyword=carbon+and+nitrogen+cycle+worksheet+answer+key PDF link annotation
    • http://luzupogakij.sportsontheweb.net/adrenal_tumors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_602dd5aec37db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_601732e411f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fd6939381c8c.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/mekuwojamivudime.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/5_love_languages_quiz_30_questions.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/67308856293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_92c47faa30ff417db1830847cf3c7b0f.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_c6605d5a0e9b46eca8240ef7ae524f9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/891e3227-854f-49bf-a750-c1a553c8f42f/88672160926.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/abhijit_banerjee_nobel_economics_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba04db99-aa39-421a-870f-ba8bb21691aa/focusrite_control_3.5.0_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcca7d2-ca7a-48d5-98d5-a4e8cae65eb9/oklahoma_drivers_license_cost_for_seniors.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/23700401761.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/23269661091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360fd46f-2cd4-4bc8-8747-77c9c435514c/are_2010_honda_pilots_good_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e092ff-cb1b-4330-b95a-4e2bfea4245e/data_structures_in_java_training.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_2197456de2a344d78eea8f265d5c0489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/155c0af4-b892-4858-aee2-52e14b25ef1e/8734812341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020b8f4d-c028-433a-8317-77c43019d0f3/76868865454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24f9470-c941-432b-abcf-ad0b52934253/zomigubax.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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 5504 bytes
SHA-256: 6c59964b2aaa72449fda5f89a6d0115d32d1154bba2300d78ec1705025e1c817
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10980 bytes
SHA-256: c52c59c1a5945ff7c5397b47b44eae0bf432cbde14030999f7ec6c784d954647