Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47cc831c57b414d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-10 22:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4d7d2aee0060e994ca35857483a88a67 SHA-1: 6b37760df582bae05567312a09b3238480d14a2d SHA-256: e47cc831c57b414d0c8733cff3b1ed79f7b8728687fab7739bec5dcc26f28584
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a 'Pdf.Phishing.Trojan'. The embedded URLs are likely used to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=1000+sat+words PDF link annotation
    • https://nanagufema.weebly.com/uploads/1/3/1/4/131483019/1445798.pdfIn PDF document text
    • https://bovojejepar.weebly.com/uploads/1/3/4/6/134670017/8646143.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://shop50off.info/30660384556rt9fe.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/9753703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/nuwirixejomamiwadojiku.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_25b5d33bde18476494ecd3d6720e8f36.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_dc7a11f9cc9d4d94b7b9cc9c344aa0f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/architecture_presentation_sheet_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/work_power_and_energy_multiple_choice_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/39493583203.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_ff75df3a20584992a767b35fe327737e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/rmit_library_subject_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/ginanudagiwisubusabesoja.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/81915158988.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_37ba600b54944f978e7081f20fcbc337.pdf?index=trueIn PDF document text
    • http://fuzaxovojige.epizy.com/broderson_crane_service_manual.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_bbab2e8c2e28485cb9afffbbc4bb9285.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/mamuzawo.pdfIn PDF document text
    • http://fusiditato.epizy.com/83307943290.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/78958137468.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_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 4980 bytes
SHA-256: 6d0c6067cfce84c00fa5fe9965fbfad33bdb765709d1ea75e4fdb1ed9ec4cf75
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 11324 bytes
SHA-256: 9b668a5e107bc7c0456c68b4f34bc351f4d80667378a4193f0720b233488541d

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