Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca2a23894a3fea9…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 02:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0bc875646e07e3f85f594e021af70366 SHA-1: afb5d9ed208ab722abbbb1c716e3dc28866e3acd SHA-256: aca2a23894a3fea9bbc67a542a018d30134ca39a0fdd790d15e585b8c49c0244
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to direct users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/wix?keyword=thigh+holster+bag PDF link annotation
    • http://banuduxirodeb.mypressonline.com/94903812519.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/tacky_the_penguin_worksheets.pdfIn PDF document text
    • http://refazali.mygamesonline.org/pevoxuxowasemikezulujun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5fdd6045652e1.pdfIn PDF document text
    • http://zewenidasi.iblogger.org/57770377510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fe5a1d4a2d1e.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/alexia_clark_diet_plan.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/paropabaru/render_jinja2_template_python.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/munodikapugokefujej.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/jasper_report_using_rest_api.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42324e7-c71f-4926-b538-4c3132673855/91007030360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc9f987-f582-4249-833b-179c149653e9/how_long_will_non_filers_have_to_wait_for_stimulus_check.pdfIn PDF document text
    • http://xesijapapun.rf.gd/historia_natural_de_la_enfermedad_segun_la_oms.pdfIn PDF document text
    • http://pipejokobakaba.rf.gd/elementary_algebra_bittinger.pdfIn PDF document text
    • http://ruxopalivefe.rf.gd/characteristics_of_social_work_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb349aa-0a1d-407d-bce6-dffc389c49dd/the_heirs_netflix_japan.pdfIn PDF document text
    • http://xitirinajeki.epizy.com/23489550616.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/where_to_learn_photography_in_lagos.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/infinix_note_phone_price_in_nigeria.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_f4e13b34c4544132b1e1e2d219564fdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/92884407344.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_c9f75bc2660b47eb865c69d608093b0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cba8f71-6466-440e-a909-e88318566ed8/el_libro_de_los_abrazos_galeano_resea.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_e6b09bf313f545eaa42006e8d57f8a74.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_df33033229694bfc931dee18bd7db9ad.pdf?index=trueIn 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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 5036 bytes
SHA-256: d869a964582038ac4c9507a186f45dcc024198b2c218dbf075ae3292ad36a2e9
font_01_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 11060 bytes
SHA-256: cc11386b8e3e37d8fbb825bc27e5c77be5ad546e6abf963245bfaf21afe16dc9

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