Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b71482462499fe…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 15:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a97ed29838a3d4376d3f496f5d24b2d8 SHA-1: 95a41a0a4e4e29d31e58fac15d2b8bfd6e3680dc SHA-256: f7b71482462499febe5e138485aaecf0ddc7e569195feb58c8babc43ac739bd5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+set+a+sharp+atomic+clock+model+%2523spc364 In PDF document text
    • http://soul-felt.com/business_partnership_deed_format_in_banglacfi13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5ffc183e91ae1.pdfIn PDF document text
    • http://quickpapp.online/sefaxuri1rsrx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff971e3300aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_6009a4fbb799b.pdfIn PDF document text
    • https://pezujereg.weebly.com/uploads/1/3/5/3/135349759/pepitovunivemi-xaparetukoju.pdfIn PDF document text
    • http://kind-insta.site/linksys_ac1600_ea6400l7wrv.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/wapaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fefbbd8e5963.pdfIn PDF document text
    • http://fortuneo.best/que_es_el_acoso_psicologiconozvq.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/sasufufa/kodaly_cello_sonata_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/kaveveven.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/86718389502.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/d_backs_logo_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/job_interview_sample_interview_question_and_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/2791165071.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/vbspu_exam_form_2018.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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 5428 bytes
SHA-256: a3d9c03bb55d7722e73a6014a36ecb460c43a9c448fc08a4b81fb566f65df801
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10952 bytes
SHA-256: 96e45d04d5a17dbc97dc388352471d83f5878f5b4c9bb4677e9e4c151cba0088

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