Malicious PDF — malware analysis report

Static analysis result for SHA-256 759517bb5a4b439e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 10:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c4375f62719c8f25ad5e6a9c19a4152 SHA-1: 55b3332142fa56104f7076a4a638a4bb162ca96a SHA-256: 759517bb5a4b439e6962e77fad2070820d48cba92327ca80564995c7f58d2603
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://baarspo.ru/award?keyword=it+support+resume+sample+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6013a1f845d6f.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/gonililokopisenu.pdfIn PDF document text
    • http://bokexetukesu.iblogger.org/2005_honda_odyssey_sliding_door_not_closing.pdfIn PDF document text
    • http://xusojuvexo.22web.org/irobot_roomba_675_review_cnet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_605b8b6cbd2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_6045f8eddb793.pdfIn PDF document text
    • http://nowanedilado.22web.org/invitation_birthday_template_word.pdfIn PDF document text
    • http://fofafik.iblogger.org/57599308625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_60395cef397fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366045/normal_600643a31d6b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadaxijenazide.epizy.com/things_wrong_with_our_society_today.pdfIn PDF document text
    • http://viwoxogopuxad.rf.gd/linear_and_nonlinear_functions_worksheet_8th_grade.pdfIn PDF document text
    • http://dazidotidipo.rf.gd/community_development_theories_in_social_work.pdfIn PDF document text
    • http://vofolosozoz.epizy.com/80637106147.pdfIn PDF document text
    • http://runapibiledudej.rf.gd/what_are_the_steps_in_product_design.pdfIn PDF document text
    • http://nizalag.rf.gd/zatixoxalubafado.pdfIn PDF document text
    • http://mimewimirul.rf.gd/bandlet_of_righteousness.pdfIn PDF document text
    • http://xudefeb.epizy.com/dikuwe.pdfIn PDF document text
    • http://buloderijapu.epizy.com/arcai_netcut_pro_apk_cracked.pdfIn PDF document text
    • http://fozajekipijijax.epizy.com/mizabozapobemewe.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/tajuzosewulanobali.pdfIn PDF document text
    • http://bigoxusu.rf.gd/sesapuwipexoxazitoje.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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5124 bytes
SHA-256: dca7b5eb3b04c610e9ec46d4ad0facbc25c153551738a3e2e8d06767f7a746ef
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10760 bytes
SHA-256: 4c57001ca5dfd4537d45857ad3eb12daa4e8011222720aa52c89a5541a0f92f9