Malicious PDF — malware analysis report

Static analysis result for SHA-256 18902784a92aab9d…

MALICIOUS

PDF

104.5 KB Created: 2021-06-04 19:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7839f7490e96ab7e8c969281d3b42fb8 SHA-1: 4819f538a0273e915eb7c1dd1eabeadb31c9b259 SHA-256: 18902784a92aab9dd5835e099785dc6787c8c284aaebad9550395eaea0e5b041
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 0.9995

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://garglob.ru/pbw?utm_term=what+to+say+when+using+anointing+oil PDF link annotation
    • https://dopesijej.weebly.com/uploads/1/3/4/6/134612330/5b9114c8b9.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/6416386.pdfIn PDF document text
    • https://fuxugikitoze.weebly.com/uploads/1/3/1/0/131070560/losikil-foxopalira.pdfIn PDF document text
    • https://gapixupat.weebly.com/uploads/1/3/1/6/131637313/8494260.pdfIn PDF document text
    • https://lijixavin.weebly.com/uploads/1/3/4/5/134598275/zosipukuka_defudur.pdfIn PDF document text
    • https://xixutusolorul.weebly.com/uploads/1/3/4/6/134685478/nitake.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/2829696.pdfIn PDF document text
    • https://kepudeveru.weebly.com/uploads/1/3/4/6/134698703/704b6.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/6ba5f64.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://nadupodifado.pbworks.com/w/file/fetch/144466308/zedadibizinerodomawob.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/72658099973.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/w/file/fetch/144551100/istatistik_2_vize_sorular_test.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/f/vidmate_install_pc_free_download.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144504195/95441493194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4db39d-d783-430d-b82b-c3026e8e7fbe/how_to_get_google_play_on_kindle_fire_7th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3cbbb4-7161-4407-a65a-9c65feeabac6/74218101619.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144615228/what_message_does_romeo_urge_the_nurse_to_give_to_juliet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e601655a-0d42-496c-9c91-77080b5d88cd/7943102082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68c07d1-1d03-4ce2-9f5d-a120d2c745dd/78424433095.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/taxelifejijux.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144571071/tudifaguwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14628 4940 bytes
SHA-256: 6604dffb25cd108d1b24cdc1e50d89a0c43ed3e73131578f53240c494bf32c19
font_01_sfnt_off0001570e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570E 14548 bytes
SHA-256: 31be19f94e0021c18ce1e1d5f8002c1d8325367d7814bb4f6ed88439444ae886
font_02_sfnt_off00018621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18621 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34