Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff376b60044e3eff…

MALICIOUS

PDF

78.5 KB Created: 2021-04-18 01:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 15fb964e37eec67d5f09c7ceab1bea54 SHA-1: 9cc52a10e239b2074c5004ce55aaec49b34fe7e2 SHA-256: ff376b60044e3effff564d487c53bccdcd0745ed06f780651dd4836a5edf79dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further malicious content. No scripts were extracted, but the presence of external URIs points to an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=common+mistakes+in+spoken+english+india PDF link annotation
    • http://muluvigopitego.22web.org/mukamuzi.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/80237100160.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/baixar_visualizador_de_apk.pdfIn PDF document text
    • http://sitatazidib.iblogger.org/folozabugovamubuxetorog.pdfIn PDF document text
    • http://dadegufewen.iblogger.org/modelo_de_anamnesis_para_nios.pdfIn PDF document text
    • http://zakukat.iblogger.org/99020664151.pdfIn PDF document text
    • http://viwudij.22web.org/college_board_sat_test_10_answers.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/71843797855.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/e2635016-ac5e-4ca4-971b-92e780eee394/jesus_calling_sarah_young_enjoying_peace_in_his_presence.pdfIn PDF document text
    • http://vepuziv.epizy.com/78843246370.pdfIn PDF document text
    • http://pinepukaxibitut.epizy.com/diferencia_entre_estadistica_descriptiva_e_inferencial.pdfIn PDF document text
    • http://zosubimonoz.rf.gd/nomenclature_of_alicyclic_compounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16082f0-636d-465c-8db0-e04285aa8f22/gejirakimumekez.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/scaricare_canzoniere_chitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/futur_simple_french_worksheets.pdfIn PDF document text
    • http://lekekavom.epizy.com/68254432520.pdfIn PDF document text
    • http://netupizorazez.rf.gd/new_gems_english_reader_class_3_answers.pdfIn PDF document text
    • http://perotufusutukes.epizy.com/atmega16_datasheet.pdfIn PDF document text
    • http://sapifux.epizy.com/dokemexawumiresuxibul.pdfIn PDF document text
    • http://buxazub.epizy.com/email_form_html_css.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/fodipudonupavufasi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/31801254426.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/67882681850.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/abrupt_synonym_formal.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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 5248 bytes
SHA-256: 9d91d5eced11dd4f470f4296fdc760e10ab60b687e92d30faae9f4980d7a3724
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 11260 bytes
SHA-256: e5e4bc2e4145c523cd522bb5448179d93cd8215e9f21424c01e23e4cf81af118

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