Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9eae8ba8520db4…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 15:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef3a877897efec519fc1f14648f01695 SHA-1: 0b3c886394e3f5ddf84fcc6d286179072237719b SHA-256: 0f9eae8ba8520db48bc0519f85036446f9f9631d73dac7101b7c3713e7c6ac9f
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=snapper+mower+maintenance'. This indicates the document's primary purpose is to redirect users to potentially harmful content. While no scripts were extracted, the presence of numerous embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

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 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.
  • 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=snapper+mower+maintenance In PDF document text
    • http://roflan.site/92035066658chti6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5ff117706e719.pdfIn PDF document text
    • http://doordash.link/peter_lynch_one_up_on_wall_street_free_downloadpr0uo.pdfIn PDF document text
    • http://virona.org/84113970634yx18v.pdfIn PDF document text
    • http://promoocaoameericanas.com/avg_tuneup_mac2e0z4.pdfIn PDF document text
    • http://kinorio5.xyz/misaxuz27zlu.pdfIn PDF document text
    • http://varietystore.website/xerixorasavapuvotdvitx.pdfIn PDF document text
    • http://amaryllis.space/venusawelimixupanuvojbn.pdfIn PDF document text
    • http://fbcopyright-center.com/ijazat_hai_songegvep.pdfIn PDF document text
    • http://fulitip.iblogger.org/80611265498.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/jagux/training_complex_cognitive_skills.pdfIn PDF document text
    • http://xumepamef.rf.gd/confusing_verbs_esl_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/how_to_remove_gridlines_from_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/luxapid.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/giduvexofelil.pdfIn PDF document text
    • http://deroselewem.epizy.com/mixofekabopuwavokobisot.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/80610943787.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/alberto_caeiro.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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 5064 bytes
SHA-256: 6e4a41502f396b33f342f62f1e974c9e138c44d558b414505774d617e0809042
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 10668 bytes
SHA-256: 8db272a8169d0aebd0ff344e632631d1eea8d216027594ea62a9f846f1466726

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