Malicious PDF — malware analysis report

Static analysis result for SHA-256 2662d0d9d3394727…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 23:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d571a81efb2a86048b60be5d0119885b SHA-1: bbb3615c4ccfe25cd6e940941472b4da857aa896 SHA-256: 2662d0d9d3394727f347508cb9bfcc1eaa2de67fa4f65e86eb1d95b21f80b13f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to potentially malicious content, possibly exploiting embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=what+are+the+effects+of+volcanic+eruption PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474988/normal_605f64ea3b0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603b1453a64b5.pdfIn PDF document text
    • https://venaresumizom.weebly.com/uploads/1/3/4/4/134468274/tutesizakulezexus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_605dd955a9c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_602052f06236f.pdfIn PDF document text
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/tebef.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/mimub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_606dd4317cc55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5fdb69a554d60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_60504fefc36ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5fe3352aebdda.pdfIn PDF document text
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/7163f.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/a50bd2b7-8065-44fe-ab3f-658485fac224/how_to_adjust_height_of_herman_miller_aeron_chair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e789af11-0ce9-4220-b541-86e728e51f74/who_is_the_girl_in_episode_4_of_the_mandalorian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60ebc36-3f25-4e5b-84ab-6b63c0b100ca/95247354555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e102eda7-d60b-47a1-877f-7dfb8e76ce6b/how_to_write_a_good_conclusion_paragraph_for_an_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/40402546624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8967d306-1ec2-4876-aeb4-1cf7decacdc2/aage_barati_peechey_band_baja_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c701e0-0c92-4fa2-8f50-d283ff87cee8/how_to_put_a_evenflo_car_seat_cover_back_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a359cb-e138-4d19-ab31-c825540090c3/67812270296.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/homeless_shelters_accepting_clothing_donations.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/gurifafanetukurejajajod.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 5176 bytes
SHA-256: 93937062080ab8c8f7b1039085f25be6f553f52636ff7021d0591a4e43c546f4
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 11264 bytes
SHA-256: f3f770ca8c110b8500f8cc2329d83767ea38377c272d62a9060d65521cfbaaee