Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10ae6a45b659bde…

MALICIOUS

PDF

77.0 KB Created: 2021-02-17 00:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc7768e3f52ab7b8ce6567150b8a2a29 SHA-1: eee7e3736877d6141a3d0132673ca2e84e0017b5 SHA-256: c10ae6a45b659bde502b0433c6b83ab7d93d66a582b0f0915197053bcff76612
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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/aws?utm_term=factoring+trinomials+guided+notes In PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/42426ffc827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_601db07bb60d9.pdfIn PDF document text
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/gunetege-bimutum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_5feec3ecc2774.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/9344b71.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/3bf3f.pdfIn PDF document text
    • http://xowivek.iblogger.org/severe_hypokalemia_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_601b7d25690cb.pdfIn PDF document text
    • https://fiwinibikevuli.weebly.com/uploads/1/3/5/3/135339450/waxatogurew_puvomakelow_fojape_vemixogezax.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/2813043.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/rejusodedobora_jagigazim_lasexesomedepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fef0dd031dd2.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/699736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fef40855009a.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/zogamegodizuru.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/be2daef218e381.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/kipojoba.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/030c2ad7dc22d4a.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/kakef/electrical_safety_first_best_practice_guide_6.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/apache_max_file_size.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/9307758062.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/divabujobafodeboxubi.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/appraisal_form_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/subnet_mask_calculator_tool.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/28314587189.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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 5216 bytes
SHA-256: ee4fb3742f6d8ad725f1f76b61e36d3c7c01ac5bbce336182d1eff549b165207
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 11340 bytes
SHA-256: bb452b16d9c7029d5e8587e9868b0a12952ae451fc370f057a61d6b3df81de3f

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