Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa29ad908d280aa4…

MALICIOUS

PDF

84.0 KB Created: 2021-03-04 15:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 06fec0ec27468be890a7b34ff50d8ec7 SHA-1: 57c2d28271c7b49a2ed44b1c477051345a842ff0 SHA-256: aa29ad908d280aa40434e39ce8c8da92db7adfdae5df3f3fb54f2a7d568b7493
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure itself are consistent with techniques used to obscure malicious content and redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+write+about+a+quote+in+an+essay PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5ff3478873274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_600ccb3881378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_6022db135edd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fe434f66b8d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujitajaxo.epizy.com/duxirevizunuronine.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/best_personal_budget_spreadsheet_template.pdfIn PDF document text
    • http://terenido.epizy.com/mivozigifovevemogixuk.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/60174175054.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_2e139c126bdf46d9aff2354fba699197.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_031b6b8e0ded42b89d41acca394d259a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/vakajagak.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_b7fe4a3e38ef47e1acc69f5fec429218.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/balfour_primary_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/40341899914.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/read_children_s_books_online_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/bluestacks_install_apk_file.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_7f2c9739bde441658e4a869700cfcce6.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_8b372dd0ab7f47a3ad8aa832fa3b5309.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/wafugiseradizipasijuj.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/birds_pictures_for_colouring.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_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 5068 bytes
SHA-256: a33be98c0d35674907c9b46defaaedb267e245a9a635a1850a3cb2293262164a
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 10592 bytes
SHA-256: 162ee28c967b3452e5578006f2fd908bca74389ff4b020d4328c7c295941afa4

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