Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215190720c636d5…

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 07:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b51664216da28858d3c81fa742c9d758 SHA-1: df68e5ed23e1d72c37906c9a93d78b2dcfe7bfc4 SHA-256: 4215190720c636d598693d1ad3ee280e58deebe6867e5b97197330579da52d51
156 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 0.9997

Heuristics 5

  • 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.
  • 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://lozipotod.ru/strik?utm_term=10.s%25C4%25B1n%25C4%25B1f+biyoloji+mitoz+ve+e%25C5%259Feysiz+%25C3%25BCreme+ders+notlar%25C4%25B1+2020 PDF link annotation
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/tikotolez_retodew_dijok_jogudezipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_5fed68f1cc991.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/zokitadadasifa-jekovejozezav-xufig-mobedoniden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_602f263e72035.pdfIn PDF document text
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/rujixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_604a8ecd910a9.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/5395960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5ff69fafb2c1d.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/cd19f298-f4dd-43df-9a88-1b8e8839af3e/kewibubawedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e6a234-ec81-4243-8b04-25df06dc3820/15395677817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3644e36f-1a89-49ea-91ab-14ddc41fbdd9/tawetasununedodopurijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69b4804-ecf5-4b4a-b656-6fad51459bbc/uppababy_vista_nordstrom_anniversary_sale_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f92035-7811-4714-b52f-a2026d250fa1/78047169527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef82d75-8be0-40c4-bf1f-7574c33b440e/how_do_you_dilute_hair_dye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f131f6-26f3-4b9f-a92a-1d5e4ae4bd1d/the_rich_become_richer_and_the_poor_become_poorer_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a5fb23-9286-4a4e-8ed1-37886cee635e/57061487524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204fd1d0-b35b-499b-981f-b71a0c54c372/orbit_irrigation_57096_6-station_sprinkler_timer_with_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464402e7-6574-4f14-8bc5-6fc48fb92593/twinkle_twinkle_little_star_poem_full_hd_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474fd251-e493-4911-be9f-195bc41ad081/puveriwekufijokar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46275537-6dee-4230-adfb-df71df5e4009/junujonukolekavarunekepod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c7b177-158b-4feb-ad5a-2e6e463b03ac/76441010560.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_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 6144 bytes
SHA-256: 1af0f6776954473d4d6a772f9423520a3d9f48f59ab72cd2177610b880f9d94d
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 12360 bytes
SHA-256: bbba669a6a62777725affea473dc99c007a6280177f9b0fe88a53627bc9de975