Malicious PDF — malware analysis report

Static analysis result for SHA-256 4776d80ff113466a…

MALICIOUS

PDF

80.1 KB Created: 2021-01-01 09:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 56e7f7cbf9158b498350a9aa691e9277 SHA-1: 746c93293e094adf20b015b27000094b36167f4d SHA-256: 4776d80ff113466a6ed7cf01751b32e31099529f546d54312fa7dc19b54589f1
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 one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it's part of a phishing or malware distribution campaign.

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://traffmen.ru/strik?utm_term=using+find+my+phone+iphone+7 In PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/negulevawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fc45d4177d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5fa1a07a92b6d.pdfIn PDF document text
    • https://pobanuruwogijo.weebly.com/uploads/1/3/4/8/134882751/zilipub.pdfIn PDF document text
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/pasaneseju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5f97164493f27.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/wobinuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f91b718843ee.pdfIn PDF document text
    • https://konoxitewe.weebly.com/uploads/1/3/4/4/134494736/2095181.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/377489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dozore/noribalavug.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/2020_irs_income_tax_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/nha_ekg_study_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/wolf_down_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/broadway_accompaniment_tracks.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 5000 bytes
SHA-256: 9abfdd478efbb3027a0d7274f575cdac07a3358387a936727897509b8036db95
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 11156 bytes
SHA-256: 1b7fa90f5217329ed517b4fb63c835675951aae85b8b0fdb6eb0218b3f91961c
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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