Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373d758fd6c4232…

MALICIOUS

PDF

71.0 KB Created: 2021-04-21 08:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 04a3543ab584157270925e3c47c7c0f5 SHA-1: ddd067218bc9a2448e3ad4326204a212aad37072 SHA-256: e373d758fd6c4232857f5bbaee406f94b547479e1c2b6377c34158cea210b6f3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, but the presence of external links points towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=what+are+the+different+types+of+style+in+literature PDF link annotation
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/8105706.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/sonexofisud-purokonitasus-moforamej-lutege.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/5597274.pdfIn PDF document text
    • http://xadebiwivupogof.iblogger.org/popapisikimorilinatu.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/efbaddb3a.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/nowuvagidomiza-genagutin-dekevodul.pdfIn PDF document text
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/4077522.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/fb2f199f2e150.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/nebovak.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/9096340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuzazepixo.epizy.com/case_interview_secrets_a_former_mckinsey_interviewer.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_745957a29c274e07b8076e0175d0b0d5.pdf?index=trueIn PDF document text
    • http://josepexagunoso.rf.gd/biophysics_books_free_download.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_4faee129e51545338fefcf323af4be29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80777e4-d242-406a-857d-854fe7fd6a2a/pobibikuvebanulu.pdfIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_4ebd5cff82c84ac6a19a314f2a986f7f.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_d5506c8b8acc476a8268f8018c45197a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e1c98b-e511-4533-a2ee-8f71c69282ea/jomelazabajefubinukijud.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/3600668665.pdfIn PDF document text
    • http://govilike.epizy.com/90329432884.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/kuxibedaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2efd9b9-1cf2-4942-9f32-ab72fd245555/90533792509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606b170d-f815-4c5e-ab9a-fd614b3dddd5/what_are_the_pros_of_wind_power.pdfIn PDF document text
    • http://zowisojaba.epizy.com/jifoguwovozevefadux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc19d62c-61d0-48d1-8908-ea68ca706642/how_oxygen_concentrator_works_video.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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 5244 bytes
SHA-256: bcc63879b21bfd0d32efcdb8f5a4a218707eb94683a6552eeaaa249742b55fc9
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10412 bytes
SHA-256: 3a405f8b316104932c8cdd5566bcca55d9c361cb684723aa108e6468d7a6d9aa

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