Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bee590398bc765d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 20:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8a03394070e049889b7201bb8671c0ba SHA-1: e3579800bf43d675d0821c32390771c945388c77 SHA-256: 5bee590398bc765d138b06ad256a1223910cb3cb836afbc27cbf8d00e1b31c0b
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The heuristic 'SE_CALLBACK_LURE' also suggests a potential phishing pretext, though the primary function appears to be link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/award?keyword=argala+stotram+gujarati+pdf+download PDF link annotation
    • http://sakhavto.ru/am_best_rating_emc_insurance_companiesombvb.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/jifunazizalofujozip.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/arduino_starter_kit_example_project_3_-_love-o-meter.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/toro_51619_ultra_electric_blower_vac_reviews.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/tewasobexeg.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/fezepuku_kufedujasa_pivefijoposu.pdfIn PDF document text
    • http://nigma24invest.online/3698823065s7d4a.pdfIn PDF document text
    • http://form-copyrightservices.com/history_of_the_knight_chess_piece70sxp.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/tai_chi_exercises_for_beginners.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/cardias_definicion.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/68708370950.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/45e054c4.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/xakimasok.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/47106238364.pdfIn PDF document text
    • https://revevujuz.weebly.com/uploads/1/3/4/6/134678323/kerabid_dejozakonukavo_gigegomawozape_kolosirisod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_81ef308073b0402d9f7eaa755705fa5d.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_ed577e9c9e2c4a3281d3f404bd7e9f93.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_6a14c2dd676a4857b5e18ae9b33b5160.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f547568-01a8-433a-8ebb-66ecdd91ddad/46590726808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333439b8-048e-4911-acd3-26e2e7506dd2/87319755708.pdfIn PDF document text
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_eddd89c5e5b74fd3afa11e37d06396be.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d8fc8a70be55446890033213810d6c21.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5516 bytes
SHA-256: b366b5b54698732586b8f88d50a788a2f89ff0339d43756f20c35b80d7f2fa03
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10828 bytes
SHA-256: faef11ced5eec91c11aa4d5a1cb7ad68432e6dda1cfa8509996a6ceb17d57e83