Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd604a1a6f8877a…

MALICIOUS

PDF

81.4 KB Created: 2021-05-06 17:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 467728cc86a2b9012981f1b6b5257aa1 SHA-1: 5e9786a555f68c143c800d229705b215ac056339 SHA-256: efd604a1a6f8877ae3d1c939a4c3cf6e65d1e3caa76672f427537908fa3aded8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=when+i+was+in+puerto+rico+summary PDF link annotation
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/gafolilup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_603bcef731e88.pdfIn PDF document text
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/93994b32f86d746.pdfIn PDF document text
    • https://gebodakejodige.weebly.com/uploads/1/3/4/3/134316683/toxujoxosuk.pdfIn PDF document text
    • https://famixupeb.weebly.com/uploads/1/3/4/7/134733803/bd36249814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6024b2ec30c74.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/centre_songhai.pdfIn PDF document text
    • http://sikirizev.22web.org/5222705550.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/vojoxizigazabudovitewaf.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/jelajugos.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/51046093510.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/mathematical_models_in_molecular_and_cellular_biology.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/c998885f-82b1-4bc3-89f9-a2efc67312d9/full_body_stretch_routine_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4762d3-bbe0-43ef-8d0b-ccaa1d264f0a/new_england_beef_tips.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/zegipuwagomabuke.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_20b3c33c1b874dc6ae9310857fbd6c75.pdf?index=trueIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/biology_mcq_questions_for_neet.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_f8b2e4492f824db0846eaa7db65665b6.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_8737520b61094c55ab634b420c537864.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86a5c88-4755-4d1e-a23f-796f8c838f45/29879702401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dbdcbd-81bc-499b-8310-ec6a8a882ac6/what_house_was_used_as_pemberley_in_pride_and_prejudice.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_2afac2817cee49a0a2953d74d13628d5.pdf?index=trueIn PDF document text
    • http://wegugoleta.onlinewebshop.net/biology_education_project_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdfbca6-67ea-4b6b-93c2-e0424b39e81b/lights_out_sgmp_2020_live_feed.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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 5348 bytes
SHA-256: e5b859fa4617eb3693b8b25c2c82fec18768adcb66305ed90059ae6ddf3b5fe2
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 12180 bytes
SHA-256: a66b0950b93bd44c5f9748240cae29656cdc7a8651664840ab0df8ea9c8b9bad

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