Malicious PDF — malware analysis report

Static analysis result for SHA-256 e909d47238d61ac7…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 05:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55e03012da08bda8eaf18d28b2fb3a39 SHA-1: db5d04adb9e6c9c03d7ad3f42197efcaebf77f35 SHA-256: e909d47238d61ac70bbd4118157cc25463334a7ae281f30eb3b68835c25a7f3d
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 0.9994

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://seumenha.ru/123?utm_term=patterns+and+algebra+grade+6+worksheets+pdf PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/economic_lessons_from_asian_tigers_japan_europe_and_america.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/kugupekuvajibidedis.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/how_to_put_a_needle_on_a_spore_syringe.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/8c6a0e13-da8f-47ad-aee6-0c8ae749cfba/what_is_a_good_cronbach_alpha_score.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_76bb4a67381a49cb952a5c4a39da148d.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_b5cd9b90405e43d3a9a72c9954d6114a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laradusa/coilcraft_0402hp_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/65630256126.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/non_resident_landlord_collection_agent_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4569a1-b481-4fcf-939c-1a75591588af/63834801209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cc981b-7920-46bc-9b9f-3823add7e7a4/99847952731.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_342040a8526d45b3934909934d2878d3.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_5b059772fe2549c2920db2d9058be310.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rujuweximitine.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/how_to_reset_motorola_xt1921-2.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_5198735db04441d5af5eb7e8af8ceda8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/69703661108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d01ce5f-d3ca-4575-bae3-8d24ac1c8288/71398560133.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/zugituterutesafuwefen.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/80401634035.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/job_interview_questions_answers_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/93073530802.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_a93a4cad4e404c7984c4b92d0ae1026b.pdf?index=trueIn 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_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 5752 bytes
SHA-256: fcc87f4f6b65d35977b3831e5c1303a3804d89d938fe370fef52d2e757ca343c
font_01_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 10904 bytes
SHA-256: 9d78ce54f536aeb8981683ef00f47d8c75a48a03b5a63706c361a37139ce1f6d