Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b588a352407a39…

MALICIOUS

PDF

91.4 KB Created: 2021-03-14 07:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2969cc85973ac7b27beb0c79055bb065 SHA-1: 95403698ff94d8484c1f9f47f205f9e0b8d42b67 SHA-256: e4b588a352407a399c06edd9936e783544c2b62fd3f39459885bab1f133b6c6b
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 0.9992

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://seumenha.ru/wix?keyword=the+invisible+man+movie+answers PDF link annotation
    • http://rorogudadusosej.getenjoyment.net/vietnam_labour_law_2020.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/furiously_happy_jenny_lawson_quotes.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/free_120_usmle_step_1_questions.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/10418781327.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/19810890856.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/365_days_of_keto_diet_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavamikilav.myartsonline.com/hernia_diafragmatica_bochdalek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc57fc3-7fd7-4640-a2eb-675743bfee4e/tuponajexonuledajuzadiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af4db73-ac80-4dd5-a510-802395d8bb62/easy_brandy_alexander_pie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d136e7-a63c-4468-9028-14ea5a249a12/vonijovatuvusu.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/61213406601.pdfIn PDF document text
    • http://bigamutalunu.atwebpages.com/human_resource_accounting_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e135ba-562a-49dc-a0e9-075e26c00991/motevunonenigamesebogim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99888715-9511-47b8-a2ec-aa072d9b567b/2018_tesla_model_3_for_sale_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff539a9-9667-4345-a2e2-c22f0fafb78d/ziretasadojagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9db076b-1a95-48f8-9ffa-96badd9a522a/14135229757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69f9e0e-b224-4a8b-b014-417f511e7067/lixipazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87b4e8e-9a9e-4bf7-93a9-0cbd2c203de5/tivisejuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e3c237-2d06-49c8-bf2a-b5fdded1af0a/futazox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50ece08-dfa2-4edb-9c10-b485763e9c9e/sexenejinaguxegetukimob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5fc6ac-1b39-4def-b6f8-3e4f1014e656/kindle_keyboard_wont_update.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_176bee6b2ad84c65b0188daaf8f03d34.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_0627c850962245cca0976df151505541.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/170569d4-3e55-4af1-a30d-1b9926ab2c53/where_do_i_find_the_model_number_on_my_jenn_air_oven.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_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 5164 bytes
SHA-256: 1e0bfe4fff6dbdc231c5e628e816f4e209e87bf4130de7d89529ab08da1aebfc
font_01_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 11772 bytes
SHA-256: 51453a0dbef360e5cf6ff4934c4101b76a755d7774fc042b9fc686403896b4ec