Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4db84baf1548d47…

MALICIOUS

PDF

80.9 KB Created: 2021-05-30 19:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d8aabf4309130337ee5d82c11e6d7b66 SHA-1: 8b4de786010475f73d9b8372d1ca88f19ce39a72 SHA-256: e4db84baf1548d47e3bfa7cb08847096e644006240a4959d4d1f8ef0f77c2ac7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://dugedepap.ru/strik?utm_term=how+to+add+a+bitmoji+keyboard` is likely part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+add+a+bitmoji+keyboard PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fee23072a0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_6067c0a8eabc1.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/a5dccbb9b26d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427528/normal_60afe34be9de3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4386336/normal_60b304672141f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5fdc0b30c7083.pdfIn PDF document text
    • https://jomefexud.weebly.com/uploads/1/3/4/7/134732593/voraganu_minatixumoj_tiwewiwukefu_xeminutovo.pdfIn PDF document text
    • https://masoluvilat.weebly.com/uploads/1/3/4/5/134576839/2659946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_60307380e796e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fef4cc10da83.pdfIn PDF document text
    • https://powonevupurig.weebly.com/uploads/1/3/4/7/134704952/toxajinif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_6005855943b3f.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/ac0b2d43-00ef-4226-bb5a-d31d1034b7a7/coleman_lantern_fuel_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3aa409-bb10-489f-80b5-a80419308614/the_jesus_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eff47d-a47f-4c34-8881-5e50619594c8/home_zone_security_led_light_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e17914f-d364-495a-8e76-acb2e23e8f4e/how_to_set_up_a_trilogy_100_ventilator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c882365-ce9f-4ae8-86f2-6976ba6bb3fb/66631936353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8874d002-dc63-4618-934b-492fe3c87bde/77221942909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d88de6-6890-4370-87c6-03500762a23b/how_much_does_a_mercedes_service_cost_uk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5196 bytes
SHA-256: 700162f53cd6e9a796e04904e834f6ca5edc190d7f33f1601008b2b5c1dcd1fb
font_01_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10524 bytes
SHA-256: a10bdbf65a17e902aa0a3c190502fe105eca05142349df8c946972ab9bbd4a4c
font_02_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16308 bytes
SHA-256: 1596e611761c49a5f36c54c528ed85dba79deed4d6a320b5bc1e46b002fffb4e