Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a5ea2bc57ece90…

MALICIOUS

PDF

73.7 KB Created: 2021-03-18 15:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f4f88c6cfd80b9382346409d12f2dc12 SHA-1: 08a46ddd79f007c96c286b86e80272586691814e SHA-256: a7a5ea2bc57ece90c21c6df849c99f6e7646642abb0682055a426e9653b1eb7c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external PDF links, one of which is a suspicious URL related to a PADI rescue diver course, likely a lure. The PDF structure also suggests it may contain embedded JavaScript, which could be used to further exploit the user or download additional payloads.

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 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.
  • 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://zajinet.ru/strik?utm_term=padi+rescue+diver+course+melbourne PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367271/normal_602ddc83c4ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_602421da3cef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fea34a826c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff0334a5bd55.pdfIn PDF document text
    • http://gutenorexus.iblogger.org/libro_los_renglones_torcidos_de_dios_resumen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_60051ff872df8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_25f409e3b40c4719b287a56c19547197.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/us_fda_guidelines_for_analytical_method_validation.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_38ea0d11df7042e79ee69102daad61b5.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_8c9256450603427a867cccae9c4b024e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/present_perfect_tense_passive_voice_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/sapuzosudukavelufopofugi.pdfIn PDF document text
    • http://vukenorap.epizy.com/catriona_gray_answer_transcript.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_9de018eac48a4e40b2894db6367e6fa3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/51740076084.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/92158409936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697d75ab-a21c-43ac-9418-bf19eb164830/63196773197.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/97701154590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523780f2-9b65-416f-972e-8849f5883aae/los_juegos_del_hambre_parte_3_reparto.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/4060164569.pdfIn PDF document text
    • http://gajoruza.epizy.com/lukiwisovivewubi.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_41f174d8ee4f41b7a20b23b35365ab42.pdf?index=trueIn PDF document text
    • http://podifugugak.epizy.com/austin_and_ally_songs_free.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5284 bytes
SHA-256: c2c6e777052910ab862d8b203043a88ae42b1358ea8f45ae3365e504f6b1b3a1
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 11644 bytes
SHA-256: 1c23572c5b13d4961acc976232b4367beba9551f301291953b93950a492b4dfa

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